Color is one of the easiest ways to convey simple messages, but when using something like an LED to represent a certain state, the LED has to be connected back to another system that does the monitoring. An international team led by scientists from the Universities of Surrey and Sussex is utilizing peacock feathers to potentially simplify this process down to one step. Modeled after peacock feathers, their team has created an opal-like crystal that can change its color by modifying its own structure in response to outside variables, meaning that they can be used to monitor any phenomena that the graphene in the crystal can observe, such as light, temperature, pressure, and a wide variety of chemical compounds, leaving the stage wide open for everything these crystals might be able to do.

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