Heidelberg is the world's leading supplier to commercial, packaging and label printing companies. Each year, for Christmas, they send their customers a calendar of the following year.

This year, Heidelberg Spain has contacted two schools in Spain, one in Madrid (IES Puerta Bonita) and one in Barcelona (Antoni Algueró) to do the illustrations for each month. Each center has done six months.

It was about illustrating, photographing or drawing the initials of each month, each in its own way and with its respective decoration according to the month.