3D street art. My first reaction was "What the hell are those crazy girls doing?" Then I realized it was the 3-D street art stuff. How do they draw like that?

3D street art. My first reaction was "What the hell are those crazy girls doing?" Then I realized it was the 3-D street art stuff. How do they draw like that?

Optical illusions can work in a variety of ways, and have many classifications. To simplify, illusions can work because of how eyes and vision...

Optical illusions can work in a variety of ways, and have many classifications. To simplify, illusions can work because of how eyes and vision...

Stare at the red heart for 30 seconds, then look away at a blank surface (wall or ceiling) and blink really, really fast.

Stare at the red heart for 30 seconds, then look away at a blank surface (wall or ceiling) and blink really, really fast.

Stare at the red heart for 30 seconds, then look away at a blank surface (wall or ceiling) and blink really, really fast.

Stare at the red heart for 30 seconds, then look away at a blank surface (wall or ceiling) and blink really, really fast.

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