The light sculpture uses proximity sensing which enables people to change colours by bringing their hand near to the surface of the light. Proximity sensing uses electronic capacitance in the same way touch screens work on mobile phones - the electronics responds to a change of capacitance brought about by people having an earthing effect on the hidden aerials underneath the surface of the light. The colours are made from combining different levels of red, green and blue light generated by multicolour LED lights. Underneath the light there are a number of small computers which have been programmed to respond to the sensing information from the aerials and generate the differing voltages to drive the LED lights. raphaeldaden.co.uk

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