RAUL GONZALEZ PEREZ / SCIENCE PHOTO LIBRARY RAUL GONZALEZ PEREZ / SCIENCE PHOTO LIBRARY
The tribar, or Penrose triangle, is an impossible object which appears to be three straight beams of square (or, in this case, beams of squares) cross-section which meet pairwise at right angles at the vertices of the triangle they form. This combination of properties cannot be realized by any actual 3-dimensional object.
Model release not required. Property release not required.