The third concept :

Ambiguity of the vision. This concept characterizes the visual deficiency of the partially-sighted or blind people, the visual effects are deviated in order to creates a certain confusion. Do we see is real? , is this an illusion?

The residences of blind people is behind the mall, on the right (for the sun) had on the line houses in front of the others.

Now, we will have to make a choice...