->I'd seen some steampunk style desk lamps made using pipe with water valves as the switch, and wanted to do something similar for a set of lighted bookshelves made with pipe. Desk lamps using val.
Water Valve Light Switch for a Pipe Lamp: 9 Steps (with Pictures)
Updated version: DIY Water Valve Light Switch for pipe lamp. Parts list in description
Water Valve Light Switch for a Pipe Lamp (Bottle Lights Pipe)
Cool! How to make an on-off switch out of one of these ... For your awesome steampunk light fixture.
Home Automation Network Protocol: A Great System for Light Control and Other Automation Features Inside Your Home
Water Valve Light Switch for a Pipe Lamp от BlackMagicPipeworks
Follow along as we show you how to use an ESP8266 to wirelessly control a DC water valve.