Chris Staecker
@chrisstaecker.bsky.social
Mathematician, Z-list YouTuber.
The text does not explain the origins of Chisanbop (Sung Jin and Hang Young Pai), but it does associate the method with the structure of the abacus. This description appears in Lieberthal's book as well.
October 29, 2025 at 10:03 AM
The text does not explain the origins of Chisanbop (Sung Jin and Hang Young Pai), but it does associate the method with the structure of the abacus. This description appears in Lieberthal's book as well.
The art is all redone- I like it a lot better than the original. Thanks to Ed's friend for sending it to me!
October 29, 2025 at 10:03 AM
The art is all redone- I like it a lot better than the original. Thanks to Ed's friend for sending it to me!
Strange phenomenon: Every time I post a new video, I lose subscribers.
My interpretation: There are some subscribers who aren't really into me anymore. But they don't seek out my channel just to unsubscribe. They will only unsubscribe when they are reminded of me, which only happens when I post.
My interpretation: There are some subscribers who aren't really into me anymore. But they don't seek out my channel just to unsubscribe. They will only unsubscribe when they are reminded of me, which only happens when I post.
October 24, 2025 at 2:54 PM
Strange phenomenon: Every time I post a new video, I lose subscribers.
My interpretation: There are some subscribers who aren't really into me anymore. But they don't seek out my channel just to unsubscribe. They will only unsubscribe when they are reminded of me, which only happens when I post.
My interpretation: There are some subscribers who aren't really into me anymore. But they don't seek out my channel just to unsubscribe. They will only unsubscribe when they are reminded of me, which only happens when I post.
"Think of other things"
October 23, 2025 at 5:18 PM
"Think of other things"
I hyped it! (Didn’t know that was a thing, but it seemed appropriate!)
October 14, 2025 at 4:28 PM
I hyped it! (Didn’t know that was a thing, but it seemed appropriate!)
The pascaline is in New York! No original stylus though 👎
October 11, 2025 at 8:02 PM
The pascaline is in New York! No original stylus though 👎
Just received in the mail the ultimate Chisanbop holy grail- the blue “Stage 2” book by Pai and Lieberthal! I thought it was never published- I said in my video it was never written. But Randi found a copy at her mom’s house! Thanks again Randi!
October 6, 2025 at 7:00 PM
Just received in the mail the ultimate Chisanbop holy grail- the blue “Stage 2” book by Pai and Lieberthal! I thought it was never published- I said in my video it was never written. But Randi found a copy at her mom’s house! Thanks again Randi!
New archival project: the Lawson Perspective Charts!
It's a set of big (25x22in) charts for perspective drawing.
Eight charts, various angles to the plane & horizon. With original instructions! The highest quality scans I could muster. I'll make a video when I have time. @archive.org links below
It's a set of big (25x22in) charts for perspective drawing.
Eight charts, various angles to the plane & horizon. With original instructions! The highest quality scans I could muster. I'll make a video when I have time. @archive.org links below
October 6, 2025 at 3:00 PM
New archival project: the Lawson Perspective Charts!
It's a set of big (25x22in) charts for perspective drawing.
Eight charts, various angles to the plane & horizon. With original instructions! The highest quality scans I could muster. I'll make a video when I have time. @archive.org links below
It's a set of big (25x22in) charts for perspective drawing.
Eight charts, various angles to the plane & horizon. With original instructions! The highest quality scans I could muster. I'll make a video when I have time. @archive.org links below
don’t get any ideas
October 1, 2025 at 11:40 AM
don’t get any ideas
In Spain if there’s a fire you dump this giant bottle of sriracha on it.
September 22, 2025 at 4:10 PM
In Spain if there’s a fire you dump this giant bottle of sriracha on it.
- old Casio FX-19 calculator
- tons of cameras
- tons of cameras
September 22, 2025 at 1:03 PM
- old Casio FX-19 calculator
- tons of cameras
- tons of cameras
Yesterday I checked out El Rasto market in Madrid. Highlights:
- two auto-numbering Bates-type stamps
- fancy old stapler
- abacus-like shipping list thing
- two auto-numbering Bates-type stamps
- fancy old stapler
- abacus-like shipping list thing
September 22, 2025 at 1:03 PM
Yesterday I checked out El Rasto market in Madrid. Highlights:
- two auto-numbering Bates-type stamps
- fancy old stapler
- abacus-like shipping list thing
- two auto-numbering Bates-type stamps
- fancy old stapler
- abacus-like shipping list thing
Today’s yard sale find: a curved aluminum ruler and French curve. Looks like they could do some damage.
September 20, 2025 at 7:30 PM
Today’s yard sale find: a curved aluminum ruler and French curve. Looks like they could do some damage.
Progress! I’m shocked- it wouldn’t do anything 10 minutes ago! I still don’t really know what all the buttons do…
September 15, 2025 at 8:05 PM
Progress! I’m shocked- it wouldn’t do anything 10 minutes ago! I still don’t really know what all the buttons do…
New old adding machine seems jammed. Should be able to pop the case and figure it out, right?
September 15, 2025 at 7:35 PM
New old adding machine seems jammed. Should be able to pop the case and figure it out, right?
New sign on the office wall. Don’t make me point at it!
September 9, 2025 at 3:20 PM
New sign on the office wall. Don’t make me point at it!
who hurt you bro?
September 5, 2025 at 3:40 PM
who hurt you bro?
Math props in Batman: Arkham Knight. Classic NCR inspired- not interactable, and the buttons aren't even 3D-modeled! Just painted on.
And honestly I'm not sure why this is even here- the game is set in "present day". Some lore I'm not privy to I guess.
And honestly I'm not sure why this is even here- the game is set in "present day". Some lore I'm not privy to I guess.
September 3, 2025 at 10:31 PM
Math props in Batman: Arkham Knight. Classic NCR inspired- not interactable, and the buttons aren't even 3D-modeled! Just painted on.
And honestly I'm not sure why this is even here- the game is set in "present day". Some lore I'm not privy to I guess.
And honestly I'm not sure why this is even here- the game is set in "present day". Some lore I'm not privy to I guess.
I just received this amazing set of hand-crafted wooden Golomb Rulers from Todd Sanders. (I made the much more pedestrian 3d-printed stand.) Thanks so much @lackriver.bsky.social!
August 29, 2025 at 1:32 PM
I just received this amazing set of hand-crafted wooden Golomb Rulers from Todd Sanders. (I made the much more pedestrian 3d-printed stand.) Thanks so much @lackriver.bsky.social!
Not bad… (generated by grok)
August 25, 2025 at 2:40 PM
Not bad… (generated by grok)
Bought two peaches
August 24, 2025 at 3:59 PM
Bought two peaches
Spotted today: Royal typewriter with homemade cover, and box o horns
August 24, 2025 at 3:42 PM
Spotted today: Royal typewriter with homemade cover, and box o horns
This weekend yard sale curiosities: fully automatic craps table? Royal typewriter, strange 4-color style stitch work, and an old stereoscopic photo set.
August 17, 2025 at 1:13 PM
This weekend yard sale curiosities: fully automatic craps table? Royal typewriter, strange 4-color style stitch work, and an old stereoscopic photo set.
NCR electromechanical cash register in the wild in upstate NY. Still in use!
August 15, 2025 at 1:00 AM
NCR electromechanical cash register in the wild in upstate NY. Still in use!