Lava lamps
Compared to some of the other lamps of its time, lava lamps were never made to cast light. Their purpose was more for creating a certain mood. It ultimately became a symbol of the space age and psychedelia fads of the period. The man credited with its creation is Edward Craven Walker. Meanwhile, Hy Spector and Adolph Wertheimer are the ones who brought the lamp to the American public. They soon founded the Lava Manufacturing Corporation, one of the original lava lamp manufacturers.