Optics: crystals exhibiting interference colours. Colour mezzotint by R.H. Digeon, ca. 1868, after J. Silbermann. https://www.rawpixel.com/image/13959241/image-background-person-artFree Image from public domain licenseHeart shaped crystal gemstone mineral jewelry. https://www.rawpixel.com/image/14041862/heart-shaped-crystal-gemstone-mineral-jewelryView licenseStill Life with Dead Birds and Game Bag by Willem van Aelst https://www.rawpixel.com/image/14263224/still-life-with-dead-birds-and-game-bag-willem-van-aelstFree Image from public domain licenseOptics: crystals exhibiting interference colours. Colour mezzotint [] by R.H. Digeon, ca. 1883, after J. 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