Ok, this is directly from the Lava Lamp website: "Lava. Its everchanging patterns are hypnotizing, yet invigorating. It is an art form. Classic and at the same time progressive. It is pre-historic and post-modern."

Ok, I don't know about that, but I do know that Lava Lamps are the essence of groovy. Sorry, blacklight, bellbottoms, and platform shoes not included!