Trying to type anything on it would be a nightmare.
Although you can play The Secretary's Nightmare in different ways, such as by dragging pieces of mattress foam over it, my favorite way is to strike it with a ping pong ball on a string. The old "Follow the bouncing ball" song cartoons come to mind as the ball ricochets off the typewriter parts.
The music it makes is always somewhat out of control and random. Because the sounds it makes are low-volume, I use a stethoscope as a means of amplification. Playing it is a very personal experience. People without the stethoscope only hear a weak suggestion of what goes on inside it.
Be sure to listen to the audio file in the last step of this instructable to here what The Secretary's Nightmare sounds like.
Step 1: THE HOLLOW STEEL BALL
Unfortunately, during the process of welding on the typewriter parts, the mirror plating was damaged. The surface now is painted.
For some reason, the notes made by The Secretary's Nightmare linger a long time. I don't know if the sphere shape has anything to do with that, but it might.