This is a video of a picture of a desktop that's been printed to appear 3-D when viewed from just the right perspective. It's really flat though -- just like Earth! "Earth isn't flat." Oh really? Have you conducted experiments yourself to prove that or are you just taking somebody else's word for it? Because, SPOILER: most people are lies and cheats. "I've seen a sailboat slowly disappear over the horizon." That's not an experiment, that's WATCHING THE SUNSET.
Keep going for the video, which starts with a demonstration of the individual elements printed to appear 3-D, then the entire desk.
Thanks to my buddy Terry, who's convinced optical illusions aren't illusions at all, but glimpses into another universe. He's not that bright.