What hole you talking about?
Its an object lighted from two sides ... what you see on those walls is its shadow.
Person watching the blue wall will be sure that lightened object is Square ...
Person watching the yellow wall will be sure that lightened object is Round ...
But in fact the only way they both find out what shape lightened object is, will be if they combine their own observations.
Its just image that shows 2 personal true statements ... and show that they can differ from actual truth.
In other words, how can speaker easily be wrong, even tho every single detail in HIS perspective checks out ... if he simply dont realize that there is more point of view fom his own.
