Similarity-5

Similarity occurs when objects look similar to one another, people often perceive them as a group or pattern.

For example in this image, there is one object that is different from the other objects, in terms of shape and color, but at the first glance we cannot see that the object has different color from the others. 

Depth-4

In this image the grids create the appearance of a corridor. Depending on where the human figures are placed the brain perceives them as being either close by or far away. The brain has been conditioned to perceive objects that are far away as smaller but yet all figures are equal in size. So the ones further away look bigger.

Point, Line, Plane-3

Are the dots white or black? Now either use the cross-eyed or parallel technique to stop the optical illusion.

Color-2

This is an example of the complimentary scheme color, and here we have red and green which are a pair of colors that are of opposite hue in the complimentary model. 

Lighting-1

I chose this picture because this kind of lighting that is used here make it very mysterious, and make us wonder whether that person is laying on something or falling, is it a kid? a women? or a guy? so the lighting in this image make the audience think about the situation of that person and curious to know more about it.