The Spanish designer Oscar Diaz designed the Ink Calendar calendar, which uses the capillary effect of ink spreading through the paper to show the date.


Every month, colored ink from the bottle that you see in the picture penetrate through the relief sheet of paper, on which the number of a month is applied, staining them in a rich color.

Ink Calendar was presented at the Sueños de Un Grifo - Diseño exhibition in Madrid.