The Planetary Orbit Clock could sit on your desk for days, even years, even lifetimes before you realized the clock's very simple logic: it's read from overhead.
Working like the original clock (the galaxy), various planets (metal balls) rotate around the sun (a bigger metal ball) to represent seconds, minutes and hours. Friends might call you a space dork, but little will they know that you are actually a time dork. And that's an important distinction, indeed.
Ultimately, $35 is a small price to pay for people not understanding why you're so weird.