Talk about minimalist, this must be the week of minimalist brain waves in the designer department! This is a lamp based on a log in a fireplace; you push down on it to turn it on, it lights up. Push down on it again, off it goes.
From the websites of Jari Nyman and Olli Mustikainen:
LOG lamp. Inspiration has come from a burning log in a fireplace. Press the wood block down and it pops up to expose the light. Press it again and it switches the light off.
Materials: various types of wood
Finishing: wood wax