This instructable also details how to make functional curved circuit boards that can serve as a case and a circuit.
It also shows a fast, easy and inexpensive way to etch patterns and solder able traces on any simple circuit board.
The video shows how the lamp is turned on and off.
The intro Pic shows the touch switch lamp on the left and some other etched curved circuit boards that await components.
Step 1: How It Works
The sensitivity is adjustable so that at a lower setting it will require you to directly touch the sensor plate. At its most sensitive setting, it will detect your finger through paper, plastic, glass, or even a brick.
The larger the sensor plate the more sensitive the switch. The sensor plate is the triangular circuit board at the front bottom of the lamp.