Heart-shaped eggs
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How to make one like this below.
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Yes, we know that Escher’s waterfall is amazing, and here are some articles that debunk the tricks. Click on the image to start reading. Link1. Link2.
@ haha.nu
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A funny project by Jay Silver from MIT Media Labs, here to its homepage on how to make one.
@ haha.nu
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From the series How It’s Made.
@ haha.nu
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Cool project by Alan Parekh, here to detailed instructions on how he made it. There is also a ready-to-build kit available at his store. Well, it is not something $20, but is definitely a cool gift for a geek. Check also other some $20 gifts here.
@ haha.nu
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… without leaving a trace. I didn’t think it is so easy. -Vlad-
@ haha.nu