This is a magnet calendar.

 

Idea is that each month consists of 30 removable magnet elements which represent days.

When the day ends, the element is transferred to the appropriate date at the bottom of the calendar.

 

For example, in October days are the leaves on the tree. One day is gone - one leaf «fell down» .

In July days are bikinis on the girls. The hotter it gets, the more girls take their bikinies off.
In March snow "melts", in August seeds disappear from the watermelon, in November birds fly away, in December champagne bubbles emerge from the bottle and burst.

 

Time goes by ...

 

ILLUSTRATOR: Lyubov Malygina, https://www.behance.net/giasemi