Do you know what an optical illusion is? You can learn all about it with these free illusion coloring pages for kids.
Optical illusions happen when your eyes play tricks on you. One type of illusion is the three-dimensional (3D) drawing. It uses lines and shading to make it look like an object is popping out of the page.

Impossible objects are another type of illusion. These pictures trick your brain using common things like stairs - but they are placed in ways that could not exist in real life. Shadows play a role in making these illusions work.
You can explore all types of illusions as you print and color the following pages.
Online Coloring Pages for Kids
Get creative with this interactive easy impossible triangle coloring page. Experiment with unique color combinations and see which one looks the best!
In addition to the usual printable coloring pages, we also have online coloring available for every coloring sheet in this post!
Just scroll down, and you'll find the coloring options for each coloring page.
Free Illusion Coloring Pages for Kids
Impossible Star Coloring Sheet
The impossible star looks like it is knotted together. You can use light and dark colors to enhance the 3D effect.

Impossible Cube Coloring Sheet
This cube will trick your eyes - is that inner piece sticking out toward you or away from you? When you color the tops of each beam a lighter color, the 3D effect is enhanced.

Impossible Triangle Coloring Sheet
The impossible triangle is one of the easiest impossible shapes to wrap your mind around. Try to figure out which side is closest to you as you color - I'll bet you can't!

Impossible Square Coloring Sheet
This square is a step up from the impossible triangle above. Can you figure out how the sides fit together?

3D Hole Coloring Sheet
The vertical and diagonal lines of the wooden planks make this hole appear in your paper! Color the hole a darker color to heighten the effect.

Impossible Trident Coloring Sheet
As you're coloring this impossible object, you might find yourself coloring the empty space around it! That trick of the eyes is what makes this coloring page so cool.

Impossible Hexagon Coloring Sheet
The more sides the impossible object has, the more interesting it is. This one has six twisted sides for you to color, each made with three faces.

Impossible Stairs Coloring Sheet
Are these stairs going up or down? They are actually doing both! That is what makes them so impossible.

3D Stairs Coloring Sheet
These stairs aren't impossible but they are three-dimensional. Use light and dark colors to enhance the 3D effect.

Impossible Heart Coloring Sheet
This twisting, twirling heart is a fitting symbol of love - you can see it in action but it's impossible to understand fully.

Which of these illusions was your favorite to color?
Did you feel like you were going to go cross-eyed from staring at them?
You can download and print all the pages on this list. Then, you can bind them together to make an optical illusion color book. You can even gift it to your friends and blow their minds, too!
See a Google Web Story of this Illusion Coloring Ideas Blog Post.
