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Wednesday, June 9, 2021
origami envelopes and letterfolds
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A while ago, I posted an exploration of the origami envelope featured on Origami USA's free diagram page that showed that the central r...
Tuesday, September 8, 2020
gods, demons, and mortals
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Raymond Smullyan's To Mock a Mockingbird introduces an interesting variation on the classic knights and knaves logic puzzles . The lyin...
from barn quilts to mosque tilings
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While travelling around southern Ontario recently, I enjoyed seeing barn quilts along the highway as we drove. Some barn quilts are truche...
Tuesday, June 4, 2019
day-knights and night-knights
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In his book To Mock a Mockingbird , Raymond Smullyan provides another variation on his classic 'knights and knave' puzzles, in whi...
Thursday, May 9, 2019
star polygon fun
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Star and compound polygons are pretty mathematical objects that are fun to draw or create in code. star and compound polygons on 2 to 9 ...
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