Dots and Lines

Image #1

Stare at the pattern for 10 seconds or longer and then switch your gaze immediately to a white surface such as a blank wall or a piece of paper. What do you see?

Answer: you will see the exact opposite of the diagram: white squares on a black background.

Image #2

Are the horizontal lines parallel to each other or are they sloped or curved?

Answer: They are parallel but put a ruler up to your screen to confirm this.

Image #3

How many black dots can you count?