The inside of an ordinary bathroom mirror contains a gridwork of wires. Pressure sensitive switches on the surface of the mirror allow pictures or messages to be scribbled which will only activate those switches.
A motion/moisture sensor activates current when someone aproaches the foggy mirror after a shower.
The picture you've doodled then materialises through the condensation.
-- 2 fries shy of a happy meal, May 08 2011

Prior art by FarmerJohn The_20Mirror_20I_20Mist
[2 fries shy of a happy meal, May 08 2011]

2 little knobs like an etch-a-sketch?
-- po, May 08 2011


Only if it's a full-length "fairground" mirror.

If it's a problem, just wear a bath robe.
-- 8th of 7, May 08 2011


useful for practical jokes, especially if it can be done in the color of blood...
-- Voice, May 08 2011


//2 little knobs like an etch-a-sketch?//

Do they?
-- MaxwellBuchanan, May 08 2011


Heh. One of us does, the other prefers using a pencil.
-- 2 fries shy of a happy meal, May 09 2011


In a bathroom font? Helwetica Condensed?
-- infidel, May 09 2011


// bathroom font //

More of a baby bidet, actually.
-- 8th of 7, May 09 2011


[+] Cool title and idea!!
-- xandram, May 09 2011



random, halfbakery