I love recursion. There's something about the way it invokes infinity that makes my head spin. Droste effect images are recursive images that got their name from a Dutch company that makes chocolates and cocoa and things like that. Continue reading →
In a previous post I talked about shapes of constant width. I didn't know of any other coins besides the UK 50p and 20p that had the property of being the same width all the way round without being circular.
Well I was recently given this coin instead of 20p: