Nixie tubes -- which resemble vaccuum tubes but do not depend on the heat-induced flow of charged particles -- have seen their day come and go. These gas-filled glass tubes, invented in the mid-1950s, where typically used as numerical counter displays. Now, Scottish electronics developer Tony Adams wants to repurpose them as magnetically levitating clocks. His Kickstarter, which has 26 days to go, is aimed at funding these unusual clocks, which do not require batteries. According to the site, "The nixie clock is powered from the base without wires and will operate without interruption for months or years. No charging is required, it just floats and works." You can see video of the clock here.