too lazy to explain rn, google what a cross-eyed stereogram is *****USE TURBO MODE***** ok here we go. So, this will take some practice to see. Try to cross your eyes in such a way that the two images align over eachother. once you have them aligned, try to focus your eyes on the image that is produced. (shift+click the green flag) wasd to move the dot (if you can see it) you can see movements every refresh
I heavily suggest not pressing "see inside" unless you have a high powered computer. the sheer amount of code is lagging behind my computer real bad D: