The Arbor Vitae (Tree Of Life) collection explores inspiration. Each piece is a reimagining of the grace, beauty, effect and presence the oak tree had. They borrow a visual language associated to worship, in an attempt to purposefully elevate the oak tree's status.

Many of the Symmetree pieces are created from a number of photographs.

Mark would typically walk around the oak tree taking up to 12 photographs. They would then be combined together.