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Hidden reveal lenses. Filters similar colors and allows others to become more prominent. Red is fairly standard and in use across puzzles, board games (like Password and Outburst), and more... the Green and Blue are for use with Wide Eye books like [Illuminature](https://www.amazon.com/Illuminature-Discover-Animals-Magic-Three/dp/1847808875/ref=sr_1_1?ie=UTF8&qid=1516382681&sr=8-1&keywords=illuminature) and [Illuminatomy](https://www.amazon.com/Illumanatomy-inside-human-magic-viewing/dp/1786030519/ref=sr_1_2?ie=UTF8&qid=1516382681&sr=8-2&keywords=illuminature) Install [debug view](https://s.codepen.io/danwilson/debug/e6b576394467be824b8f2dc5977b329c) to home screen on iOS to get working on iPhone (iOS does not allow camera access in an iframe, needs iOS 11).
This Pen uses: HTML, CSS, JavaScript, and