From left, Mt. Horeb Middle School students Emily Raisbeck (8th grade), Carolyn Walters (8th grade), Becca Amick (ladder, 8th grade), Tim Wipperfurth (ladder, a project engineer from Mead & Hunt, Inc.), and Jonnie Winkler (6th grade), work on the construction of a tree from canned food items in U.S. Bank Plaza in Madison, Wis., Tuesday, Nov. 30, 2010. The tree, comprised of about 2,150 cans, is about 10 feet tall and is 6 feet at its base. Wipperfurth assisted the students in planning the construction of the tree. The students volunteered for the project, most of them being interested in engineering, building, or giving, according to 8th grade science teacher Deb Winkler.