When Christian Schallert isn't cooking, dressing, sleeping or eating, his 24 square meter (258 square feet) apartment looks like an empty cube. To use a piece of furniture, he has to build it.

Located in Barcelona's hip Born district, the tiny apartment is a remodeled pigeon loft. Christian says its design was inspired by the space-saving furniture aboard boats, as well as the clean lines of a small Japanese home.-YT