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...