The lava lamp celebrates its 50th birthday Tuesday, and though it's more kitsch than classic design, the piece remains just as memorable as mid-century furnishings from Eames, Noguchi and Saarinen.
British inventor Edward Craven Walker designed the lava lamp in 1963 after he spotted an intriguing oil-and-water egg timer at a pub.
"Because it was so completely new, we had to convince people it was worth going with, particularly when it came to selling," Walker's widow, Christine Baehr, said in an interview with the BBC. "Some people thought it was absolutely dreadful."
When did they know they were on to something? "The day a store in Birkenhead phoned to say that Ringo Starr had just been in and bought a lava lamp," Baehr told the BBC.