Designs may include abstract, symbolic, or functional elements. Some shapes crafted and grown are purely artistic; perhaps cubes, circles, or letters of an alphabet, while other designs might yield any of a wide variety of useful shapes, such as clothes hangers,[41] laundry and wastepaper bins,[41] ladders,[42] furniture,[36] tools, and tool handles. Eye-catching structures such as living fences and jungle gyms[42] can also be grown, and even large architectural designs such as live archways, domes,[36] gazebos,[42] tunnels, and theoretically entire homes[14] are possible with careful planning, planting, and culturing over time.[11] The Human Ecology Design team (H.E.D.) at the Massachusetts Institute of Technology is designing homes that can be grown from native trees in a variety of climates.[6]