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Build your own impossible 3D triangle!

Photo Sunday: "Illusion"

Why 2D is more fun than 3D

This week's theme being "Illusion", I decided to retry something I did a few years ago - building an impossible 3D triangle. I found instructions here and got busy. Once done, the thing looked nothing like a triangle; the trick is to look at it from just the right angle, preferably with one eye. The camera makes it almost look real.

6 Comments

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#1
quimby

I think that this is really awesome.

#2
Erik

Thank you quimby! :)

#3
karina

how to do that??

#4
Erik

Hi Karina,

it's quite simple actually - for folding instructions, just follow the link:

http://www.coolopticalillusions.com/illusions/coolprinttriangle.pdf

I found using a fairly a long lens (>100mm) helps "flatten" the look of the triangle. Getting the right angle is critical. Put the triangle on the floor or on a table and walk around it to find the right spot. Mount the camera on a tripod there. The tripod helps, since you can make small adjustments to the angle and composition without having to start over every time. Hand-holding gets very tiresome. Keep shooting and adjusting until you get it right.

#5
mohsin

well done

#6
lola

so easy to do but hard to see !!!

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Erik Moberg  2025