Patent ID: 7507136

Claim:
A construction set comprising: a plurality of elements having polyhedral shape, each of said elements comprising: (a) a plurality of faces comprised of passive and active faces; and (b) said passive face includes a plurality of equally spaced ferrous protrusions disposed and permanently secured on the surface of said passive face, and (c) said active face includes a plurality of equally spaced first recesses disposed on the surface of said active face, the bottom center of each said first recess including: (d) a magnet of polyhedral shape disposed and permanently secured in a second recess thereof, the magnet including an upper surface face, and said upper surface face positioned exposed in said first recess, whereby an element's passive face can be joined to another element's active face, wherein said ferrous protrusions of said passive face are thereby joined by magnetic force to said magnets recessed in said active face.