What type of decorative lamps are these?
Correct answer: Lava lamps

Myffa
Oddly "Mathmos " was the term used for the mysterious substance on which the city floated in the spoof/comedy S.F. film " Barbarella". I wonder which came first?
(It also gave us the name "Duran Duran").

j hope
✌️ groovy 😎

Queen Esther
Never really was into lava lamps! but seeing the pic! now I have probably changed my mind?!

Castra
I had a lava lamp when I was a teen and we bought one for our daughter when she was a teen.

Excuse the Kuz
Lava lamps are great when you're "small."