To make the base you just cut a piece of 12 x 12 cardstock in half to 12 x 6. Next you fold that in half. Now front and back, there are four 6 x 6 panels. Then you attach the four seasons to each one of those panels. A stand made from cardstock keeps the calendar upright. Each of the four panels has a seasonal tree image and three months of calendars. For full tutorial in PDF format click here. For the calendar in PDF format click here.