Papers and colour

I do print outs or colour copies of all these things that I like, and then a pile collects at home. So last year or the year before, time seems to be rushing by so fast, I stuck them all up on a board and mounted it in my garage. So sometimes in the mornings I sit in my car and  I look at all these things that once inspired or moved me and I still enjoy them. The one that makes me laugh every time is the maths problem: find x (see bottom right).