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According to TechCrunch, The engineers were able to make it work by patterning a thin wafer of glass on one side with microscopic, three-dimensional structures that are positioned very precisely in order to scatter any inbound light in precisely the same way that a curved piece of glass would
The design is a type of “metalens”, a wafer-thin material patterned with microscopic features that work together to manipulate light in a specific way. Researchers claim it’s the first flat fisheye lens to produce “crisp, 180° panoramic images”.