This Monthly Measure, by London-based industrial designer Sebastian Bergne, is for those who want a tactile calendar (and have the desk space to spare).
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It’ll also do double-duty in a pinch:
“Monthly Measure is both a perpetual calendar and ruler. The star is positioned on the serrated side of the ruler to show the day and date in the month and the date is easily changed by rolling the star along the ruler. Dates are placed every centimetre so Monthly Measure can also be used as a 30cm metric ruler.”
Source: core77