So, in 2003 / 04 I weren't only working on the "Hilfsdrache", but also on an special Mousepad.
That Mousepad was created out of perspex, an aluminium rail and serval ultra-bright blue leds and an usb connector.
To really make that pad special and "one of a kind", I created an carving with an Dremel Multitool into the upper one of the two perspex layers.
The light of the leds is shining directly into the uper layer and is broken on the positions, where the material is carved.
As result of that, the Carving itself shines out blue - while the rest of the perspex is still translucent.
Power for the LEDs is delievered by an USB Connector that can be plugged into any USB Port on any PC with an Standard USB Type A to Type A Cable.
