Photo de stock - 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 glass vessel filled with clear or translucent liquid; the wax rises and falls as its density changes due to heating from an incandescent light bulb underneath the vessel.

Photo de stock: lava lamps (or Astro lamps are a decorative novelty item, invented by British accountant Edward Craven Walker, the founder of Mathmos, in 1963.

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