IQ light^TM is a self assembly lighting system made up of interlocking quadrilaterals. Lamps of various shapes and sizes can be constructed by linking together the identical elements.

The IQ light^TM system was designed in 1972 by Danish designer Holger Strøm, who was then working at the Kilkenny Design Workshops, Ireland. He was originally asked to create a modular construction for a cylindrical and a spherical lamp, both to appear to be the same size, to be used in a Christmas display.

The trade name IQ light^TM refers to the geometry: Interlocking Quadrilaterals, and not as you might think: Intelligence Quotient. Have fun!