The next 2 pictures were taken in a square not far from Adam & Tara's house. From a distance it looks like a rough round of wood but the detail is amazing.
I spent some time a few days ago at the M.C. Escher museum in Den Haag. You can get a bit lost trying to figure out how he created some of the impossible structures and sketches, many of them morphing from one creature to another (i.e. fish to birds).
Escher's art is fascinating and at times a bit twisted. I was drawn to the eye below. If you look closely you can see a skull in the pupil.