Using ink spreading across paper through capillary action to show the date...GENIUS! Love this calendar designed by Oscar Diaz. Each month a bottle of ink spreads across the paper embossed with dates, filling in the numbers. I want one!
Here's a project description from dezeen:
"Ink Calendar make use of the timed pace of the ink spreading on the paper to indicate time. The ink is absorbed slowly, and the numbers in the calendar are ‘printed ‘ daily. One a day, they are filled with ink until the end of the month. The calendar enhances the perception of time passing and not only signaling it. The aim of the project is to address our senses, rather than the logical and conscious brain."
(images from dezeen)