There's a gadget for that. Gimme a sec, I'll show you.

[ Josuke disappears into the hallway, popping back into his room and taking out his Totally Globular. It's a round orb with galaxy-like colours swirling around inside it. Now, he returns back to Apollo's apartment and sets the gadget down. With a press of the button, the entire room changes in scenery. What was previously a plain-looking room now looks like the galaxy (default setting), with stars glimmering and comets passing by. ]

It's cool, huh? You can change it to pretty much anything, and if you press one of the buttons it makes people float too!