A mind blasting object that is made out of pure impossibility and under suspicion to be created by Satan.
Often used by math teachers to show 'How cool math can be'.
Also referred to as:
'But this side goes below that bar and...wait, what?'
Because it generates so much frustration if tried to comprehend it is also the main reason for suicides of kids under the age of 12 ( Just above Spinach ).
When I tried to re-build the Penrose triangle it vaporized my braincells to tiny bits!