Have you ever seen sidewalk chalk art that looks like a realistic hole? (See photos below.) This is done through an optical illusion and the use of value. 

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There are two tutorials on how to create your own hole optical illusion. I have added both a beginner version as well as one that's more advanced. 

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**Bonus idea, once you have drawn your hole add a lego man looking down and take a cool photo. 

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