Free Optical Illusion Colouring Sheets

I was looking around pinterest today and found these really cool optical illusions that Amy Allender did with her 3rd grade class.

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She had her third graders draw their own lines and circles. There's no way my six year-olds could do that, so I made up my own grids for them to colour. I made two in black and white and then decided to colour them, also. Each grid is 6 inches square.

I had so much fun making the one with the circle that I made another with a heart. 

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