Engelder4

Engelder4

A closeup of the Mona Lisa shows unique patterns created by the canvas and the paint shifting over time.

A closeup of the Mona Lisa shows unique patterns created by the canvas and the paint shifting over time. This study, called craquelure, is a passion of Terry Engelder, a world-renowned geoscientist who is retiring after more than three decades at Penn State.

IMAGE: Penn State
Licensing and Use