You can create a variety of things with the massive sandbox game Minecraft which includes a massive floating Macintosh computer. ALUSKY made this floating replica in his Minecraft world. He built it pixelbrick by pixelbrick and added an ethereal "Hi".
It's quite impressive. While the "resolution" of the Minecraft materials isn’t good enough to show the Mac OS running, he did have the right dimensions and even the handle at the back. All it needs now is a one-button mouse, right?