Etienne Burdet leans over a glass table, places his elbow in a spring-loaded support clamped to its edge and uses both hands to cut a virtual tomato into thin slices. The tomato is one of several manipulable objects displayed on a touchscreen fitted with force and motion sensors, motors and light-emitting diodes, all of which are connected by Bluetooth to an Android tablet. Burdet finishes slicing the tomato and moves on to unscrewing the lid of a virtual jar.
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