A lava lamp (or Astro lamp) is a decorative novelty item that contains blobs of coloured wax inside a glass vessel filled with clear liquid; the wax rises and falls as its density changes due to heating from an incandescent light bulb underneath the vessel.
A lava lamp (or Astro lamp) is a decorative novelty item, invented by a British accountant Edward Craven-Walker in 1963. The lamp contains blobs of coloured wax inside a glass vessel filled with clear liquid; the wax rises and falls as its density changes due to heating from an incandescent light bulb underneath the vessel.