Assertion: penrose triangle | /r/HasProperty | impossible object
Facets:
Source sentences:
text: The Penrose triangle, also known as the Penrose tribar, is an impossible object.
text: The Penrose triangle, also known as the Penrose tribar or the impossible tribar, is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing, but cannot exist as a solid object.