It’s like one of those friction-operated flashlights, where you have to squeeze to get light. Except for the fact that the light is television, and that instead of squeezing, you have to walk. It’s a prototype pair of shoes that bestows upon the wearer one minute of TV time for every 100 steps taken.
(New Scientist: “Smart shoes decide on television time,” by Will Knight [May 18, 2005])