Simon making a puzzle of "squared squares", a concept he learned via Numberphile. One square of 112 by 112 cm (the smallest possible of the squared squares) is made up of squares that each form a sum of two or more neighboring squares. Simon later completed the whole puzzle, together with his little sis. They had to pick up the tiniest square with a pair of tweezers! Simon drew all the exact pieces of the puzzle on a sheet of paper first, but then – open source minded as he is – he decided to create a website where the pieces would be available for everyone to print out. We’ll post the link here once the website is online (I sometimes literally beg Simon to put projects online, as he always considers them unfinished or not good enough). He also wrote a webpage about the concept of squared squares, but (surprise!) hasn’t hosted it on GitHub yet either. A screenshot of the webpage and a more detailed description of this project are available in our blog: https://antwerpenhomeschooling.wordpress.com/2018/02/09/squared-square-puzzle/ The Numberphile video on Squared Squares: https://www.youtube.com/watch?v=NoRjwZomUK0