Disk Calendar

Disk Clock takes the idea of clock and turns it inside-out by moving the faces instead of the hand.  Disk Calendar extends the time period to week, moon, and year.

This is a calendar of sorts, built on natural cycles.  Since the regular pace of a 'clock' doesn't align well with irregular months and leap years, the pace is even.  Thus, the year follows the solar year, and a moon stands in for a month.  Weeks are thankfully regular, and work just as you'd expect.