That isn’t water in this artsy fountain – it’s mercury.
The Mercury Fountain was made by American artist Alexander Calder, and was commissioned by the Spanish government in the 1930s to celebrate the country’s mercury mining heritage.
Today the fountain can be found in the wonderful Fundacio Joan Miro gallery in Barcelona, Spain.
But while the fountain was first displayed in the open air at the 1937 World’s Fair in Paris, it’s now housed behind a pane of glass.
Mercury is highly poisonous, and the fountain is enclosed so that viewers don’t touch or breathe in the fumes produced by this toxic work of art.