|
|||||||||||
|
|||||||||||
Do you see the up side or the down side of this stairs ? |
Is the inner square horizontal ? |
||||||||||
The up pointing triangle is an artefact |
The Peter Tse's virtual pyramid. |
||||||||||
Encircled dots seam farther from center. |
|||||||||||
|
|||||||||||
File: visual.html, 2002-09-02 - Robert L.E. Billon - Last update: 2010-11-08 |