Ask HN: inspirational maths posters for kindergarden?

Our kindergarden will undergo certification, and there are a number of aspects that will be evaluated. Since apparently it is desirable to confront the kids with art and architecture, I wonder what to do about maths. Obviously a lot of kindergarden maths is very basic (basic geooetric shapes, counting, measuring), but if art is OK, I thought why not show them fractals or cellular automatons?

It would be great to have a nice picture book for kindergarden, for example? So far I could only find "The beauty of fractals", which inspired me as a teenager (more than 20 years ago). I couldn't find a lot of good posters yet, either. Wasn't sure where to look, though - checked Wolfram Merchandise and did a Google search...

Thoughts?