Try to count the number of black dots on the image below...
Are the lines below straight or are they curved?
When you look at this image, which are the first arrows that you see? The yellow ones or the green ones? Can you find them both?
Look at the circle in the center - does it appear to be moving?
This image appears to be wavy. Tip: Move the scrollbar on the right up and down to maximize the effect
Does the orange coloring to the right appear to be darker than the orange on the left? They are the same color but the positioning of the orange on the green and white stripes makes it look otherwise