Living next door to a fan of the first two of these can be a bit of a nightmare due to irritating noise levels.
But now a happy confluence of needs has resulted in this - a solitude box.
Called the "danbocchi", it is sound-proofed to 30 decibels meaning you can sing and game as loud as you like without too much neighbourly disruption.
Or you could just sit in it and hide from the dark, cruel world outside safe inside your reinforced cardboard cocoon.
All for the bargain price of But 600 (£375).