My roommate will be moving out soon and moving in with her boyfriend. As a parting gift, I felt the need to make them something super awesomely nerdy. They both LOVE Portal, so I immediately thought of the companion cube. I decided that a clock would be a great functional piece that they could enjoy and revel in its nerdiness.
Step 1: Materials
Wooden base (square)
String (I used hemp)
Something to mix your paint in
Painter's or masking tape
Something round (not spherical) to use as a template. The diameter should be able 1/2 the size of the side of your wooden base.
Exacto knife or razor
Everything on this list (except the power drill) is available at your local craft store.
I used water based paints for the companion cube. I would not recommend using hemp for the string. I would recommend using something with a much more uniform texture.
Step 2: Paint the Base of the Companion Cube
Before you can actually start this, you need to mix your paint. I used 3 parts white to 1 part black for this color. I mixed the color until I got an even grey color. I then slathered a nice even coat on to the wooden piece. I coated all of the sides as well so that the clock would be viewable from all angles.