TYWKIWDBI posts this fascinating image. The piano fits neatly into a corner. And it’s not the only corner-shaped piano out there.
Where is it? Does it work? There’s a lot of speculation on reddit about whether it would be mechanically possible.
None of the library databases that I have access to mention anything like this piano. The best clues that I can find suggest that this or a very similar corner-shaped piano exists at a piano-themed museum in Chongqing, China. It might also be at the Australia Piano Warehouse in Melbourne.