The Known is finite, the unknown infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to reclaim a little more land.  -T.H. Huxley, 1887



This is a simple experiment. A transmitter coil is driven at a fixed frequency. The receiver circuit contains a coil and capacitor circuit which is tuned to the frequency generator. The LED acts as a crude bridge rectifier and lights up as energy is transferred from the transmitter to the receiver.

The LED only lights when the two coils are parallel. When they are perpendicular the oscillating transmission magnetic field is not felt by the receiver coil.