slim furniture can create an illusion of height, making the room feel more spacious." You don't have to start from scratch ...
The same goes for bedroom wardrobes and chests of drawers; tiny clothes take up less room, so stick to small proportioned furniture for as long as possible to leave more floor space for play.
I had to get creative to make this 70-square-foot room work ... the office space was too small to serve as my art studio and seemed impossible to make into a bedroom. But since the budget fit ...