penrose_stairs
A famous impossible object created by Lionel & Roger Penrose. A staircase which one can continually ascend or descend yet return to one's starting point. Sometimes called an optical illusion for convenience sake.
h4. External links
A famous impossible object created by Lionel & Roger Penrose. A staircase which one can continually ascend or descend yet return to one's starting point. Sometimes called an optical illusion for convenience sake.
h4. External links