'Heat Camera' interactive exhibit, Science Museum, London, 1992.
© Science Museum / Science & Society Picture Library
This exhibit is in the Launch Pad gallery of the Science Museum, London. It detects infra-red radiation, which is not visible to human eyes. Everything gives out infra-red radiation, warm things giving out more than cool things. On the screen, warm things are shown in red or yellow, and cooler ones look blue or black. A girl is using the exhibit.