PING
Not that math is my cup of tea, this artist has always held a fascination; beginning with the purchase of a calendar and 12 prints of his individual sketches.
The STAIRS is still one which truly baffles the eyes and remains a favorite.
Even bought a soft cover book “M.C. Escher-27 master prints” while in a DC/NY art museum. Don’t remember which due to the number of years which have passed.
Thanks for posting this AND the link. Off....to watch the film. :-)