Heerko Groefsema
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heerkog.bsky.social
Heerko Groefsema
@heerkog.bsky.social
20 followers 29 following 42 posts
Assistant Professor at the CS department of the Bernouilli Institute of the University of Groningen. Applying formal methods to BPM. Likes to check compliance of change.

https://hgroefsema.nl
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Reposted by Heerko Groefsema
riraro.bsky.social
⚠Disclaimer: Any perceived references to real-world people, corporations, or opinions are coincidental. Whatever your opinion is, on any topic, skeleton and shark agrees with it.
🤔
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! 1. Shark: Why won't people resist the evil billionaire? Skeleton: Some are but... 2. Skeleton: Most people won't even leave his Nazi propaganda platform if it cost them 10 followers... Shark: Weak! 3. Skeleton: Aren't YOU still on there? Shark: That's different! My favorite sports team is on there
March 29, 2025 at 7:49 PM
heerkog.bsky.social
Happy to announce that our paper "Managing and Anticipating Out-of-Order Events in Online Compliance Monitoring" was accepted at the 37th International Conference on Advanced Information Systems Engineering, CAiSE 2025, Vienna, Austria, June 16–20, 2025.
March 4, 2025 at 10:52 AM
Reposted by Heerko Groefsema
riraro.bsky.social
Never come between a shark and its sandwich!🥪🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -A Sphinx blocks skeleton and shark's path- Skeleton: We must pay a tribute to pass... Shark: It can't have my sandwich!! Skeleton: No one asked... Panel 2. Sphinx: Actually... -Sphinx yoinks sandwich with the staff- Shark: HEY!! Panel 3. Sphinx (tasting the sandwich): This is the WORST sandwich EVER!! Shark: Wow!! RUDE!! Now I don't even want to pass! I'm going home!
March 1, 2025 at 6:13 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Shark see no hinder, only solutions!! 🏂🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels. Panel 1. -Shark with a new snowboard- Shark: Look at my board! I'm going to be an alpine legend! Panel 2. Skeleton: Question... How? Shark: Duct Tape! Skeleton: Duct Tape? Panel 3. -Shark wrapped to the board with duct tape- Shark: This is genius!!
February 12, 2025 at 8:39 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Toast... or toasty? 🌴🦈🌴
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Skeleton reading a document- Skeleton: This energy bill is outrageous! Shark: Don't look at me, I cut back on toast! Panel 2. Skeleton: It must be a mistake! Shark (walking out of frame): You should call the company... Panel 3. -Shark relaxing in an outdoor toasty tropical climate, defying winter using two large patio heaters, a fan and some potted plants-
February 9, 2025 at 8:27 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Cursed you say? Better take a sample just to be sure...
🧀✨🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Shark looking at a wheel of cheese- Shark: AAAAHH! You got a CURSED cheese! Skeleton: What!? It looks normal to me... Panel 2. Shark: It's WHISPERING to me! Skeleton: What does it say!? Panel 3. Shark: "Eat me" Skeleton: -.-'
February 8, 2025 at 6:58 PM
Reposted by Heerko Groefsema
riraro.bsky.social
It equalizes the cold! Or something! It's science!! 🍦🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Shark and skeleton outside- Shark: It's so cold! Skeleton: It's called WINTER! Shark: Know any spell that can warm me up? Panel 2. Skeleton: I got some advice... Shark: Yes? What is it!? Panel 3. Skeleton: ...Stop eating "emergency" ice cream! Shark (now holding a giant ice cream cone): NEVER!!!
February 5, 2025 at 8:58 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Been a few days but honestly haven't been in a comic mood. And no, shark doesn’t really understand what tariffs are... 💸🦈
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels. 1. -Shark blocking skeletons path- Shark: Halt! You must pay the new kitchen tariff to pass! 2. Skeleton: I just want to put the groceries away... Shark: Then you have to pay up! Skeleton: Oh.. I guess I'll just eat all the food myself instead... 3. -Shark upset- Shark: WHAT!!? That's not how this works! Skeleton (walking away): It is now...
February 3, 2025 at 9:24 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Please watch our ad for the ad so you can be hyped about the hype... 🍿🦈💀
#art #comic #FantasticFour
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Shark in front of a screen- Screen: And now for the Fantastic 4 trailer... Shark: Yay! Screen: ...Teaser! Shark: What? Panel 2. Screen: And now for the Fantastic 4 trailer... Shark: Here we go! Screen: ...Hour countdown! Shark: Noo!! Panel 3. Screen: And now for the Fantastic 4 trailer.... Pre-show!! Shark (visibly defeated): Why are you doing this?
February 4, 2025 at 7:54 PM
Reposted by Heerko Groefsema
riraro.bsky.social
I'm as confused as you, shark! 🦈🕰
#art #comic
Comic art doodle of skeleton mage and shark. 3 panels. Panel 1. Shark: I DEMAND to know why we aren't making plans for Halloween! Skeleton: Because it's January...? Shark: That's not possible... Panel 2. -Shark looks at the calendar confirming it's January- Shark: NOOOO!! Time must be broken somehow! Panel 3. Shark: I reject your reality and substitute my own! -Shark crosses over January in the calendar and writes "Oct"-
January 29, 2025 at 9:01 PM
Reposted by Heerko Groefsema
riraro.bsky.social
What?
#art #comic
(If you knew that reference and late tribute you're awarded one gold star ⭐)
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Shark and skeleton looking at a boiling cauldron- Panel 2. -Shark drinks the brew from a small flask- Shark: It is by will alone I set my mind in motion. It is by the juice of Sapho that thoughts acquire speed, the lips acquire stains, the stains become a warning. It is by will alone I set my mind in motion. Panel 3. Skeleton: What? Shark: What?
January 28, 2025 at 8:19 PM
Reposted by Heerko Groefsema
riraro.bsky.social
It's all about interpreting the data! 🤔🦈
#art #comic
Art comic doodle of skeleton mage and shark. 3 panels. Panel 1. -Shark appears with a strange looking device- Shark: I've built an AI detector! Let's scan you just to be safe! Skeleton: Uh... Sure...? Panel 2. -Skeleton gets scanned by sharks strange machine- Panel 3. -Shark looks at the result screen- Shark: NO LIFE SIGNS!!?? You're one of them! Skeleton (unamused): That is the only explanation...
January 27, 2025 at 8:51 PM
heerkog.bsky.social
It really is shocking..
riraro.bsky.social RiRaRo @riraro.bsky.social · Jan 25
I figured I would do a quick and simple review of Star Trek: Section 31 today. 🖖
#art #comic
Art comic doodle of skeleton mage and shark. 3 panels. Panel 1. -Shark visibly upset- Shark: They RUINED Star Trek! Skeleton: You've said that of every installment since Voyager... Shark: This time for REAL! Panel 2 -Skeleton watching TV- Skeleton: How bad can it really be... Panel 3. Skeleton: That was SHOCKING.... Shark: Welcome to my world!
January 26, 2025 at 8:20 AM
Reposted by Heerko Groefsema
riraro.bsky.social
When left unchecked it's not a question of "if" but "when"...
#art #comic
Art comic doodle of skeleton mage and shark. 3 panel. -Skeleton and shark walking though a forest landscape- Panel 1. Shark: Why do you even care about what's happening in the human world? Skeleton: Because when fascism grows it doesn't stop at borders or species, eventually it consumes everything. Panel 2. -They keep walking in silence- Panel 3. Shark: Can I... Can I still be excited about Switch 2? Skeleton: Yes.
January 22, 2025 at 8:25 PM
Reposted by Heerko Groefsema
riraro.bsky.social
You do you, shark! It's not easy keeping up with the social media trends and platforms 🍭🦈💀
#art #comic
Art comic of skeleton mage and shark! 3 panels. Panel 1. Shark: Ah, TikTok is down! Oh it's back! ...And it's gone again! Skeleton: Why do you even care? Panel 2. Shark: I'm going to become the worlds best candy cane influencer shark! Skeleton: That's not a thing... Panel 2. Shark (sulky): Tell that to my two regular viewers! Skeleton: Including yourself in that figure? Shark: ...Yes.
January 19, 2025 at 8:47 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Haven't we all dreamt of saying that? Not exactly warp speed but it still counts! 🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. Skeleton: So how are you steering the iceberg? Shark: Cutting-edge natural currents and wind propulsion! Panel 2. Skeleton: In other words... We're randomly drifting? Shark: That's what I said! Panel 3. -Shark and skeleton on a small iceberg in the vast ocean- Shark: Wind-assisted autonomous navigation system... Engage!
January 15, 2025 at 9:06 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Only one small shark can save the cruise industry from itself! 🚢🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels. Panel 1. -Shark with a microphone and captains hat- Shark: Welcome aboard shark cruise, the finest way to experience nature! Panel 2. -Skeleton looking around- Skeleton: It's an Iceberg... Panel 3. Shark: Here at shark cruise we prefer the term eco-friendly and sustainably sourced open cabin platform! NO REFUNDS!!!
January 13, 2025 at 8:10 PM
Reposted by Heerko Groefsema
riraro.bsky.social
The evergreen wish fulfillment when facing an endless amount of snow. If you've been there you know what I'm talking about. 🦈🐲
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Skeleton finds shark clearing snow with a shovel- Skeleton: How is it going? Shark: Not great. There's so much snow, this is taking forever! Panel 2. Skeleton: Need a helping hand? Or a larger shovel? Shark: I'm thinking dragon... Skeleton: Dragon? Panel 3. -A large green dragon fly by breathing fire and melting the snow- Skeleton: Oh...
January 11, 2025 at 6:55 PM
Reposted by Heerko Groefsema
riraro.bsky.social
In a sour mood. Dealing with reality tomorrow. Maybe.
#art #comic
Art comic doodle of skeleton mage and shark. Shark: The TV isn't plugged in! Skeleton: I know. Shark: And the WiFi is down!? Skeleton: I know. Shark: What's going on!? -no reply-
January 20, 2025 at 6:16 PM
Reposted by Heerko Groefsema
riraro.bsky.social
🦑🌊 Ah, the dream of an ocean view! 🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Shark showing a blueprint for skeleton- Shark: So this is what I got in mind! Skeleton: An underwater castle? Panel 2. Shark: Think about it! Self-cleaning floors! Under-ocean views! A coral garden! Skeleton: But I don't live under water... Shark: I got just the thing! Panel 3. -Skeleton now in a shark suite- Shark: See!! You would look right at home! Skeleton: You're off the project!
January 8, 2025 at 7:48 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Priorities! 🏕🦈💀
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels. Panel 1. Skeleton: I can't believe you destroyed the house... Shark: Every project has an element of risk! Panel 2. Skeleton: Did you at least bring the emergency tent? Shark: Of course I did! It's right here! -Shark holding a bag- Panel 3. -Shark has deployed a very small blue tent with a shark pattern on it- Skeleton: That's not my tent... Shark: I sold it to get this one! Look at the cool shark pattern!
January 6, 2025 at 8:23 PM
Reposted by Heerko Groefsema
riraro.bsky.social
It's building time. 👷‍♂️🔨🦈💀
Got the vision! Got the tutorial! What could go wrong!
#art #comic
Art comic doodle of skeleton mage and shark. 3 panels. Panel 1. -Shark appears in construction gear with a hammer- Shark: I'll fix this place up! Skeleton: But I like it as it is... Shark: Just you wait... Panel 2. -Shark whacks the hammer into a wall- Skeleton: That's a load-bearing wall... Shark: Don't worry, I watched a Youtube tutorial! Panel 3. -Skeleton and shark standing in a ruins of the home- Shark: Let me tell you about the future of open plan living...
January 5, 2025 at 7:26 PM
Reposted by Heerko Groefsema
riraro.bsky.social
It's been a while! 💀🦈
A rare low-energy moment from shark as the holiday season concludes.
#art #comic
Art comic doodle of skeleton mage and shark. 3 panels. Panel 1. Shark: How can the holidays already be over? There was so much I wanted to do... I was going to eat so much food. Make the best decorations. Have the best celebrations... Panel 2. Skeleton: But... You did all of that... Shark: ... Panel 3. Shark: Can we go again? Skeleton: Would the last candy cane cheer you up? -Skeleton reaching out with a candy cane- Shark: Yes!
January 4, 2025 at 6:43 PM
Reposted by Heerko Groefsema
riraro.bsky.social
Ending the year with a blast! 💥🦈💀
It's fine. Probably. 🦈
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels! Panel 1. -Skeleton watching shark with a wheelbarrow full of firework rockets- Skeleton: More rockets? Didn't you just get a batch? Shark: I did! Panel 2. Shark: But what can I say! ...This is a demanding project!! Ultimate joy comes at a price! Frame 3. -Skeleton finding shark's "project", a homebuilt massive rocket strapped with even more rockets- Skeleton: I don't think my insurance covers gigaton firework explosions... Shark: I call it the BOOM SHARKALAKA!!
December 30, 2024 at 8:19 PM
Reposted by Heerko Groefsema
riraro.bsky.social
An act of kindness or trolling? 🦈💀🎩
#art #comic
Art comic doodle of skeleton mage and shark! 3 panels. Panel 1. Shark: I feel bad about destroying your hat in that last experiment... Panel 2. Shark: ...So you get to borrow my favorite hat!! Skeleton: You REALLY don't have to... Panel 3. -Skeleton in a way too small hat balancing on the top of the head- Shark: You've never looked better! Skeleton: Great...
December 28, 2024 at 6:26 PM