The Ink Calendar by Oscar Diaz is a fun concept to change your perception of time. According to Dezeen, the calendar "enhances the perception of time passing and not only signaling it." As the paper absorbs the ink, the dates are highlighted throughout the entire month until it's time to update your wall art. Each month comes in a different color corresponding to the weather and mood of each month, ranging from deep blue in December to red in the summertime. It's probably not fun to change your calendar each month, but like a good timepiece, it's going to take a little manual labor to keep the clock ticking.