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 Astro Lava Lamp The Original | eBay
How do we make a Mathmos Astro/Astrobaby Lava lamp? - Mathmos Production movie - YouTube