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Title: lava lamps contain blobs of coloured wax inside a glass vessel
Caption: 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.
Credit: Album / Photo12/Ann Ronan Picture Library
Image size: 5518 × 3801 px | 60.0 MB
Print size: 46.7 × 32.2 cm | 2172.4 × 1496.5 in (300 dpi)