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Craig S. Kaplan

@isohedral.ca

430 followers 146 following 71 posts

Mathematics, Computer Science, Art, Design, Music, Soup, Pedantry. he/him/anything Mainly over at @csk@mathstodon.xyz, but happy to follow people here and might check in occasionally.

Posts Replies Media

Craig S. Kaplan @isohedral.ca · 03/07/2026

Wow, an especially productive night. It would appear that I was so happy about my purchase of eyeglasses in Indonesia that I celebrated by signing up for a mess of online casinos.

A screenshot of the message list from an email inbox, split and arranged into three columns. The first two emails are a receipt from an optician on the island of Java in Indonesia, and the others are all welcome messages and promotions from online casinos, mostly in German.

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Craig S. Kaplan @isohedral.ca · 05/06/2026

isotropic.org/papers/chick...

A diagram resembling a computer systems arrangement of components solving a complicated problem, except that every box is filled with some variation of the word "chicken". From the legendary paper "Chicken Chicken Chicken: Chicken Chicken", by Doug Zongker.

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Craig S. Kaplan @isohedral.ca · 03/06/2026

Welcome to my gmail inbox basically every morning. A bunch of people in Indonesia and Malaysia using my address for various online services, or attempting to use it as a recovery address. (Oh, and this leaves out the person who recently used my address for their car insurance in India.)

A screenshot of an inbox, split into two columns. A few messages are redacted. The remaining messages are all "wrong-number emails", messages attempting to use my email address for their own purposes. Most of them are attempts to recover google account for which my address is the recovery address, or attempts to set my address as a recovery address, or attempts to log in to services (e.g., TikTok) using my address.

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Craig S. Kaplan @isohedral.ca · 01/12/2025

Originally created as a final project in the undergraduate computer graphics course at the University of Waterloo. We still have the shrink-wrapped physical media in the lab!

A photograph of the original packaging for the computer game Tux Racer, still wrapped in plastic.

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Craig S. Kaplan @isohedral.ca · 30/11/2024

That's right. Equilateral triangles, squares, and hexagons are the only regular polygons that tile the plane (on their own). No convex polygon with more than six sides can tile. But here's an example of a house-shaped, convex, equilateral pentagon that tiles.

A tiling by a house-shaped equilateral pentagon, formed by the union of a square and an equilateral triangle.

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