Make the most of your storage – Instead of closed cupboards or cabinets, try open storage. If you forgo doors on your cupboards or cabinets, this will allow people to see the walls behind and lend an illusion of space.
Use glass – Full or partial glass doors will allow people to look in and still lend an illusion of depth. Mirrors have long been used to create the illusion of space; mirrored cabinet doors will also save the same purpose. Recessed storage space, shelving that is flush with the wall or cupboards that recess into the wall, adds storage without consuming floor or air space.