Of course, you know about the impossible triangle (very classical optical illusion).
![Impossible triangle](https://www.wikihow.com/images/9/94/Z_impossibletriangle07.jpg)
Do you know how to draw it? It is complicated indeed and most people will do some ugly sketch instead of a nice optical illusion. However, this is quite simple. It is all a matter of starting it right thanks to the help of: “How to Draw an Impossible Triangle“.
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