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Flies and moths are naturally attracted to light. This lamp shade has holes based on the form of the pitcher plant enabling access for the insects but no escape. Eventually they expire and fall into the microbial fuel cell underneath. This generates the electricity to power a series of LEDs located at the bottom of the shade. These are activated when the house lights are turned off.
A mechanised iris is built into the top of a coffee table. This is attached to a infra red motion sensor. Crumbs and food debris left on the table attract mice who gain access to the table top via a hole built into one over size leg. Their motion activates the iris and the mouse falls into the microbial fuel cell housed under the table. This generates the energy to power the iris motor and sensor.