Pareidolia

The terms refer to how a person perceives certain things.

"a psychological phenomenon in which the mind responds to a stimulus usually an image or a sound, by perceiving a familiar pattern where none exists".

So it easy to see things that are not really there. The most famous ones can be water stains on wood that can form a face, clouds that look like rabbits, etc.

Remember the 'Magic Eye' pictures and books?

Simulacra

The term refers to the relationship between or among reality, symbols and society.

The dictionary defines simulacra as:

"something that looks like or represents something else".

The Latin meaning (from the word 'simulacrum') is:-

"Likeness, image, representation, form or portrait".