Cast Mobius - Hanayama Metal Puzzle

It is a twisted surface where the front and back are indistinguishable. 

In this puzzle, obstacles are placed on that surface, blocking the way like a maze. 

As you move forward, the front becomes the back, which becomes the front again.. A most perplexing feeling. 

"Belt" is the theme of the puzzle.

Invented by Oskar Van Deventer from the Netherlands.