Crystal of Iceland Spar (1878), from The Principles of Light and Color.
Source: Smithsonian Libraries and Archives
https://pdimagearchive.org/images/e417eda7-14bb-452b-8d02-664cbf645a46
#iceland #ether #color #crystals #psychicphenomena #colortheory #bookillustration #photomechanical #art #publicdomain
