Fun with color effects and illusions

There is no gradient in the gray bar in the middle

Hard to believe: The gray bar in the middle of the picture is based on a single color (no gradient)!

Ignore the text and concentrate on the different colors

Try to ignore the text and just say the color name of each word. Name the colors as fast as possible and you will see it's not that easy.

Same color on different backgrounds

The blue and orange lines have the same color values on the left and on the right side.

Dark spots appear between the black quads

Look at the picture below. Do you see dark spots between the gray quads? The picture only contains white dots between the black squares. The visual effect is widely known as Hermann-grid illusion.

The color difference between two colors is most visible on a similar background

This picture shows the Crispening effect. In all three squares both the upper and the lower blue rectangles are completely identical. The upper rectangle is a bit darker in all of them. But you can see the difference best on the right because the background has nearly the same color values.

The square A is exactly the same shade of gray as square B

The checker shadow illusion is an optical illusion published by Edward H. Adelson. The square A is exactly the same shade of gray as square B. Find more information on the Wikipedia website.