The Tree is an office space divider and a work of art designed by professor Eero Aarnio. The Tree can be used singly or in groups as a space divider and visual element. The Tree is available in three colours.
Proceeds from The Tree were used to plant 13,500 trees in Peru in 2008–2010 in a World Vision project. Martela continues to donate a part of its income from The Tree to the activities of World Vision Finland.