The "expanding Solo-leaf tree is a donor-recognition tree that uses individual leaves mounted to clear acrylic leaf shaped backers. These acrylic backers are mounted to the wall with a screw and anchor. Add-on sections are available for those who have purchased a Samara Expanding Solo-Leaf Tree in the past and are ready to add more leaves. All sections are numbered, and the tree starts with the basic configuration of 105 leaves consisting of sections 1,2 and 3. To make the 105 leaf tree larger, you would need to add sections 4 and 5 which would give you 174 leaves total. By simply choosing the next consecutive numbered section up from your existing tree, you can add leaves all the way up to 597 leaves total.