Ah, ribbon on a Christmas tree! A timeless classic and a festive staple. The key to achieving that vertical look is to create a pattern with the ribbon, starting at the top and working your way down. You can use the same pattern for each side of the tree, or you can switch it up for a more asymmetrical look. Make sure to use enough ribbon to cover the entire tree, but not too much that it looks cluttered. And don't forget to add a few bows here and there for an extra touch of elegance!