The Reflective Practice collection are smaller pieces exploring the colour and changing light of seasons on the Symmetree Oak. Each is an impression of memories spent studying the oak tree during the 3 years that Mark photographed it. He uses an original technique that he developed to combine both print, mixed media and painting in resin on paper.

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, which he often combines in the final pieces.