The most noted example is a modern sculpture designed by the American artist Alexander Calder and commissioned by the Spanish Republican government for the 1937 World Exhibition in Paris. The artwork is a memorial to the siege of Almadén, which then supplied 60 percent of the world's mercury, by General Franco's troops. A direct counterpart is Picasso's Guernica. Calder's mercury fountain, now at the Fundació Joan Miró in Barcelona, is displayed behind glass for safety reasons.
- Calder's Mercury Fountain at the Fundació Joan Miró
- Photos of Calder's Mercury Fountain by Mary Ann Sullivan
- Video of Calder's Mercury Fountain