What 1960s fad lamp features colored wax blobs floating in liquid?

The iconic lamp known for its ever-changing display of colored wax blobs floating in liquid is indeed the lava lamp. These captivating devices feature a glass vessel containing a clear or translucent liquid and a "bolus" of wax, typically resting at the bottom when the lamp is off. When illuminated, a light bulb in the base heats the wax, causing it to expand, become less dense, and slowly rise through the liquid in mesmerizing, amorphous shapes. As the wax reaches the cooler top of the lamp, it cools, becomes denser again, and descends, creating a continuous, hypnotic cycle.

The lava lamp was invented in 1963 by British entrepreneur Edward Craven Walker, who was inspired by a homemade egg timer he saw bubbling on a pub stove. He spent years perfecting the design, initially calling it the "Astro Lamp." American businessmen acquired the rights in 1965, renaming it the "Lava Lite Lamp" and establishing the Lava Manufacturing Corporation in Chicago.

The lamp's popularity soared in the late 1960s, becoming a prominent symbol of the psychedelic era and counterculture movement. Its slow-swirling, vibrant wax was seen as a "head trip" that offered "a motion for every emotion," perfectly aligning with the experimental and free-spirited aesthetics of the time. Though sales experienced a dip in the 1970s, lava lamps saw a resurgence in the late 1980s and 1990s, cementing their place as a beloved piece of retro decor and a testament to their enduring, calming appeal.