This build is not inexpensive but is certainly simpler than previous water-cooled lamp projects we’ve seen. On the other hand, a custom system can let you make use of the hot water you produce.

Water has a captivating quality and evokes strong feelings. The Ripple lamp by Denmark-based Rikke Frost for Bo Concept ...

Katzel: Inside of a lava lamp, you've got wax ... Katzel said it's mostly water. And since wax doesn't mix with water, that makes a lot of sense. But, as you can see, it's not just water.