Ah, folding a napkin into a Christmas tree is a fun and festive way to decorate your table for the holiday season! To start, you'll need a square napkin. Fold the napkin in half diagonally to create a triangle, then fold it in half again so that you have a smaller triangle. Now, unfold the napkin so that it lies flat. Next, take one corner of the napkin and fold it up towards the center, creating a long, narrow triangle. Then, fold the opposite corner up to meet the first fold. Finally, fold the two remaining corners up to create a tree-like shape. You