ALTA (Almost Lighter Than Air) EM-rimdrive

An idea for a low-torque electromagnetic fan driven from the rim rather than from a motor housed at the center. This assembly would go into a lifting body filled with helium that is just a bit heavier than neutrally bouyant.

NeoBrick

Visualization of a mortarless brick system.

solar concentrator

Solar collector with secondary reflector that shoots the beam back through the center of the dish to a water heater, kiln, or Sterling engine.

mathematical engraving

An idea for defining Celtic knot-work patterns (for example) and engraving them into wood.