MoMA Spindle Perpetual Calendar: Electric motors were the inspiration for the Spindle Perpetual Calendar designed by Paul Koh. The magnetic rotational system, with no separate parts, allows the design to spin freely on its base. Use it month after month by rotating the day of the week to align with the fixed date columns and create a sense of perpetual time. Made of ABS plastic, aluminum, stainless steel, and magnets. Approximate size: 4" x 2" UPC: 708444946198