Abstract: Sets of blocks, each set being a plurality of similarly shaped polyhedrons having faces of at least two different polygonal shapes. A set may consist of truncated octahedrons, of pentagonal prisms or of dodecahedrons. Magnetic or other means are provided in the faces so that matching faces may be joined and the blocks of a set built up in a large variety of close packing arrays without overlapping or interstices between the blocks. The blocks may be solid or hollow and may be coated with metallic material.

Abstract: A light bulb is provided that may be hung from a ceiling and which does need any type of light fixture thereabout. The light bulb itself acts as a fixture and is connected to a light socket having a top cover plate and a mounting piece mounting the top cover plate thereabove. In one embodiment of the invention, the mounting piece has a pair of diametrically opposed circumferential slots for receiving therein the prongs of the light bulb, the slots lying adjacent to a pair of metal terminals cast into the plastic of the mounting piece. A spring holding element holds the prongs in the slots. In the second embodiment, the mounting piece is threaded to receive a threaded portion of the light bulb and has a lower annular groove and central aperture for receiving therein a ring-shaped metal contact and a split prong contact of the light bulb. A plurality of metal strips partially positioned in the annular groove serve to hold the ring-shaped metal contact in place.