it actually just a 3D optical illusion known as the penrose triangle which when looked at from a certain angle creates the illusion seen in the picture
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1 up, 3y
i could go into more detail for those who dont understand
6 years ago I taught myself how to draw that with nothing but a pencil a napkin and a memory of seeing it in a book of optical illusions and never thought about it again for 5 years and somehow I still remember how to draw it