3D Illusion Sidewalk Art

[FinsnFur]

Every see those chalk and paint drawings people do on the ground that look 3D and make you see something thats not there?
Here's a short clip compilation that was posted on YouTube last month for 2013. I've always wondered how they go about it...I'd love to see one from start to finish, and if you watch the clip to the end, they give ya a little taste of what it entails. Kinda cool.

[Hawks Feather]

Artists who have a "gift" for perspective can do this type of work.  I couldn't do it with a 3-D camera.

Jerry

[FinsnFur]

I couldnt either but it sure fascinates me.

[CCP]

Some if those I have not seen. I haven't ever seen them putting one together and thought that was cool..

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[nailbender]

 Pretty cool. Liked the time-lapse.