Lesley
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liupinn.bsky.social
Lesley
@liupinn.bsky.social
56 followers 110 following 30 posts
Formerly @pinn. London / Singapore / New York. Gr 5 math teacher, former PreK-4 math coach, Desmos Fellow.
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liupinn.bsky.social
Had our Grade 5/6 lunch club fair this morning. Some clubs drew crowds with food. The Math Art table drew crowds with play : ) #MathArt
Six children creating Spirograph designs on a large sheet of paper. Three children playing with wooden Einstein Hat tiles.
October 1, 2025 at 7:48 PM
Reposted by Lesley
erwanrivault.com
Launch day 🚀

We’ve just released @chartlecc.bsky.social - a daily chart game!

Your job is to guess which country is represented by the red line in today's chart. You get 5 tries, no other clues!

Play today, come back tomorrow for a different chart with new data and share with your chart friends 📈
Chartle - A daily chart game
Guess the country in red by analysing today's chart
chartle.cc
September 12, 2025 at 1:41 PM
liupinn.bsky.social
Got to see both the women's doubles finals on Sunday and the men's doubles quarter finals on Friday at the Queen's (HSBC) Championships in London last week. #MathPhoto2025 #even
Two pairs of male tennis players in the middle of a game. Two pairs of female tennis players in the middle of a game.
June 28, 2025 at 8:50 PM
liupinn.bsky.social
Bernar Venet's 17 Acute Unequal Angles (2016) at London's Frieze Sculpture 2017. #MathPhoto2025 #Angles.
17 different steel beams bent at acute angles, layered to create a spiky profile. Side view of 17 different steel beams bent at acute angles, layered to create a spiky profile. 17 different steel beams bent at acute angles, layered to create a spiky profile. The artist's name and name of the piece (Bernar Venet, 17 Actule Unequal Angles 2016, Corten steel), along with a Please Do Not Touch or Climb sign are in the foreground.
June 21, 2025 at 9:36 PM
liupinn.bsky.social
Alicja Kwade's WeltenLinie (2017) at the Venice Biennale and the Hayward Gallery in London. It brings to mind #symmetry, but isn't quite symmetrical at all. #MathArt25
WeltenLinie (2017) at the Venice Biennale. A brown rock is reflected in a mirror, but only halfway. The other half of the reflection is actually a white rock (since the mirror reflecting the brown rock stops halfway). WeltenLinie (2017) at the Venice Biennale. A cream-colored rock looks like it's being reflected in a mirror, but the reflection is half green and half silver. WeltenLinie (2017) at the Hayward Gallery. Visitors taking photographs of various rock and wood formations that appear to be reflected in several mirrors, but not all the reflections are true. WeltenLinie (2017) at the Hayward Gallery. A gold-painted piece of wood is half-reflected in a mirror. The other half is a white piece of wood.
June 15, 2025 at 7:42 PM
liupinn.bsky.social
Two very different James Turrell pieces (Deer Shelter Skyspace at the Yorkshire Sculpture Park in 2009 and Leading at Friends Seminary in 2025) #MathPhoto25 #square
A white chamber with a square-shaped aperture in the ceiling. The square looks out onto a blue sky with a black bird flying in the bottom right corner. A sun spot is cast along the right wall. A white chamber lit in dark red and pink light with a square-shaped space in the ceiling. The square is lit with a dark blue light.
June 6, 2025 at 3:27 PM
liupinn.bsky.social
#HandsOff London, April 2025
A hand holding a handmade cardboard sign that says, "Courage is Contagious" A group of protesters outside the National Gallery in London holding up signs. Signs include, "If you're not outraged, you're not paying attention," "The most important office in a democracy is the citizen," and "Get your hands off!"
April 5, 2025 at 9:59 PM
Reposted by Lesley
flowingdata.com
Dishonest charts are coming from all directions, and they're only going to hit harder. Unless we push back. So, an interactive guide: Defense Against Dishonest Charts flowingdata.com/projects/dis...
Defense Against Dishonest Charts
This is a guide to protect ourselves and to preserve what is good about turning data into visual things.
flowingdata.com
February 13, 2025 at 9:45 PM
liupinn.bsky.social
The fifth year of our MS Math Art Lunch Club is off to a gentle start. Fewer kids than previous years, but still the same amount of joy. Today was the first time in all these years that we explored the Fold and Cut Theorem. Lots of exploration, trial and error, and imagination! #MathArt
Several green paper stars (and a few other non-stars but similar polygons) on a table. They all have crease lines from where they were folded before they were cut. Hands of three students folding or unfolding pieces of green paper. Lots of other pieces of paper on the table (some with recognizable shapes like squares, others folded or crushed up), along with lunch trays and pairs of scissors.
November 18, 2024 at 11:47 PM
Reposted by Lesley
johngolden.bsky.social
Pretty amazing #dataviz of super-wealth. mkorostoff.github.io/1-pixel-weal... So hard to get the scale. #socialjusticemath
Wealth, shown to scale
Wealth inequality in the United States is out of control. Here we visualize the issue in a unique way.
mkorostoff.github.io
October 27, 2024 at 12:25 PM
liupinn.bsky.social
Shared this video with my kiddos today and they loved it! I also learned that the un-cancelled cancelled Leap Day happened in 2000. I had no idea back then. thekidshouldseethis.com/post/how-doe...
February 29, 2024 at 6:19 PM
liupinn.bsky.social
The Math Art Lunch Club kiddos had so much fun with the small spirograph sets I cut from scrap acrylic...they even started making little spirograph monsters! It was 30 mins of play and joy. What's not to love? I dream of cutting a large spirograph that will work with chalk outdoors.
A student drawing on a sheet full of spirograph patterns. A scanned page of orange spirograph patterns labelled with the size of the gear and number (counting holes from the middle of the gear) A page with blue spirograph patterns including a spirograph monster.
February 8, 2024 at 8:02 PM
liupinn.bsky.social
So, apparently in Switzerland, you can regularly buy eggs in boxes of 4, 6, 10 or 15, and also, there are brightly colored eggs year round! #unitchat #eggchat @triangleman.bsky.social
A shelf of eggs in plastic containers (with 6 brightly colored eggs arranged in a circular formation in each container). One container of 6 brightly colored eggs in a circular formation and one container of 4 eggs in a square formation. Shelf with cardboard containers of 4 or 6 eggs.
December 17, 2023 at 10:25 PM
Reposted by Lesley
triangleman.bsky.social
Hat tile contest winners are in!

www.nytimes.com/2023/12/10/s...
December 10, 2023 at 10:55 PM
liupinn.bsky.social
The Math Art Lunch Club that I run for Grade 5-8 kiddos once every fortnight is just the loveliest. Even on a busy week, there is lots of joy.
A student drawing lines following Hitomezashi stitching rules. A student coloring in half of a square tile in yellow (split diagonally) to create a Truchet tile. There are ten other colored tiles on the table. An equilateral triangle split up according to Hitomezashi stitching rules and colored with a range of cool colors.
December 2, 2023 at 7:04 PM