What is the first image you visualize in your head when you think about a calendar? Probably a table with numbers arranged in 7 columns and 5 rows to display the full month ahead. We use it every day, whether on your phone or on your wall. Same design no matter the medium, the same format has moved from posters to digital apps without any alteration.
We are surrounded by objects that have history, sometimes that span centuries, and we completely ignore it.