A tactile display made from a watery gel that changes shape to show objects on its surface has been developed by German electrical engineers.It uses a hydrogel, the type of material used to make soft contact lenses, which consists mainly of water bound up within a polymer. Some hydrogels can swell or shrink in response to changing conditions like temperature or acidity.
Andreas Richter and Georgi Paschew from the Technical University of Dresden turned to those abilities when trying to develop a new tactile display for blind people.
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