How about a Sci Fi Your Pi / Enchanted Objects cross-over post for a change ?
Let me introduce the Magic Lamp! What’s special about it, is that it is turned on or off depending on where you place it on the desk! It also creates colourful effects on walls and ceiling when turned on. An Adafruit Trinket and NeoPixel Ring are powered wirelessly by having the charging base hidden inside the desk’s surface. By moving the circuit above the base, the Trinket is powered on and animates the NeoPixels.
For details on the build, check out this post: Magic Lamp with wireless charger, Adafruit Trinket & NeoPixels