The Christmas calendar fir tree consists of a number of folding boxes, which are held together in the centre by a cardboard tube. The folding cartons become larger towards the bottom, forming a triangle in the shape of a fir tree. A paper star is placed at the top of the tree. The special feature of this calendar is the combination of the shipping-friendly packing size and the easy conversion to a 3D calendar by twisting the individual folding boxes. Depending on the space available, the tree can either be opened out or hung up to ensure just the right presentation. The calendar is also 100% recyclable, as it is made exclusively of paper and corrugated cardboard, completely doing away with the usual plastic thermoformed parts.