Chelsea Rae Nordstrom's 'Perpetual Calendar' is a unique laser-cut calendar dependent on light for its visual appearance. The calendar comes in a box with different laser cut squares which are then put into a sheath that hangs on your wall.
The idea is that light filters through the laser cut numbers and letters in the sheath to illuminate the date and month. The 'Perpetual Calendar' is a pretty innovative way of reminding yourself of the date.
Light Filter Calendars
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