PUZZLE 093 Don't be a Square

The poster in the picture contains cube-shaped boxes stacked up on top of each other.
How many squares do you suppose there are altogether?

Hint 1

You are being asked how many squares there are 'in the picture'.
Keep in mind the difference between 2D and 3D.

Hint 2

Each side of a cube is a square, but when a cube is drawn like this, the sides appear to be a different shape.

Hint 3

Look more closely at the whole picture.
Is there an actual square hiding somewhere there?

Super Hint

Pay attention to the poster's frame.

Answer for 'Don't be a Square'

The answer is '1'.