Boulton-Watt steam engine

The entrance dome (detail) of the central pavilion of the Giardini in Venice, decorated in 1909 by Chini (1873-1956) for the 8th Biennial Art Nouveau, illustrating the evolution of art. The 'architectural elements' for false ceilings are in the foreground. Credit: dalbera/Flickr, CC BY 2.0

Crosstalk: When Galileo Saw Some Moons, and Other Stories of Invention