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Me too, I am pretty sure it is diffraction pattern. I wonder if they calculate the matrix and print it from numeric data or they print it like an hologram from the original shape. I think they calculate it. I am curious of the maths behind all this and the physics. I know what is interference...

Is someone know exactly how the shapes are made for the lasers toys ? On the right you can see what the transparent tip look like trough a microscope. There is no visible pattern of the butterfly. I can only see squared patterns. My guess is that its works with constructive and destructive...