It uses ~1/16 plexiglass/acrylic both clear and black 6 LED's and 2 AAA batteries.
My son had gotten some pictures to color from a local kids event.
I thought I could color in the picture a little differently.
I imported a picture of the picture into Corel Draw.
From there it was converted to line art and incorporated into the frame layout.
The LED's fit in the comb like areas.
After engraving and cutting the pieces out on a laser cutter they were assembled.
The LED's were inserted and the leads threaded through the holes.
The leads were folded over and soldered together in parallel.
Battery terminals were fashioned out of wire and soldered to the LED's
A couple of zip ties to hold it all together and install the batteries.
You can see from the side photos the clear separation of the color layers.
This effect is called light piping and is used in all kind of electronics display.