Build a contraption that looks somewhat like a triangular box kite. The frame is made of three balsa poles, each 1.5 mm thick and 75 mm high. These form the vertical corners. (Balsa this spindly can be cut with scissors.) Place them 200 mm apart from each other, in parallel. Connect the bottoms of each pole with three horizontal balsa poles (200 mm long). Two thirds of the way up attach three more horizontal poles. Glue three sides of aluminum sheeting to this lower portion. Use cyanoacrylate glue.
Connect the tops of each pole (placed 200 mm apart) with extremely thin copper or steel wire. Attach balsa legs, 30 mm long, to the centers of the aluminum sheets, not the legs. The entire device will be extremely light and extraordinarily fragile and difficult to handle without its crumpling. The device will only work if the aluminum stays unwrinkled.
From the power supply's positive pole, attach a thin, loose wire to the wire atop the device. From the power supply's negative pole, attach a loose wire to the aluminum sheet on the device. You will need 30 to 40 KV at 500uA (about 300 times more powerful than standard household current). This is extremely high voltage and highly dangerous. Make sure to turn off and discharge the output through a resistor to the ground before touching the power. Do not turn on the power supply at all unless you are already very experienced working with high voltages.
Turn the power on. The device should float magically above the floor, still attached by wires. It works by driving an ion wind, or ionized air (ozone), downward, just like a rocket, which also drives air downward. Larger devices can be made by horizontally adding more triangles, but this increases ozone production and becomes a danger to the experimenter's lungs through inhalation. For information on more ion motor experiments, also look it up under the names lifter, hexalifter and ionocraft.