lava lamps (or Astro lamps are a decorative novelty item, invented by British accountant Edward Craven Walker, the founder of Mathmos, in 1963. The lamp contains blobs of coloured wax inside a
Mathmos Heritage Astro Lava Lamp Review - Slinky Studio
File:1990s Mathmos Astro.jpg - Wikimedia Commons
Lava Lamps Part 5: Mathmos Astro Baby Blue/Red at Daytime - YouTube