The key is to stagger them like bricks, so one block covers the seam of two underneath it. The blocks have a channel to allow a power cable, reinforcing wooden dowels or LED strips to illuminate or stabilize larger structures. It is a very efficient modular system to have all one size blocks.
Could it comprise the next emergency living structure following a disaster? Several pallets of blocks lowered by a helicopter into an area with limited road access could provide quickly assembled modular housing for refugees. ##
(Photo credit: wired/EverBlock)