the SNES could also do this! in fact, the same hardware feature was used to do effects like the keyholes in Super Mario World and the X-Ray Scope in Super Metroid it's also how the pseudo-3D perspective effects in Super Mario Kart were accomplished

Ah, I knew the SNES could do all that, but didn’t realise it was related technology! I need to replay some SNES games and keep an eye out for the Amiga sky. Then, I guess, rename it.