The Sphere-shaped Mirror

The free tickets for Tokyu Bunkamura Museum have arrived again to my mum who has some shares of the company group.
Luckily my favorite woodblock-print artist M.C.Escher was exhibited there now.
I first saw his works 4 years ago at the same museum but this time it's entitled "Super Escher" so should've been something super. The difference from the exhibition four years ago was that there were many drafts showed this time which told us how he thought, used math and drew his works. He must have been very patient to do such a elaborate job. He drew things which reflected in a sphere-shaped mirror and "mirror" is one of the keywords of his works.
The exhibition was again very busy. One thing I want to mention is that they provided us a free audio (and visual!)-guide by Nintendo DS which is mainly designed for playing games. That was great and easy to handle. I really wanted to take it back home ...