“…These include blocks of foam rubber (Rodrigo et al, 2007), Lego™ bricks, Meccano™ wheels (Stacey et al, 1994), wooden pegs, wire mesh (Aubrun and Leitl, 2004), miniature fir trees (Lee and Lee, 2012), bottle brushes (Liang et al, 2005), 3D printed fractal models (Bai et al, 2012), automotive bulbs (Bohm et al, 2013) and architectural model trees (Meroney, 1968;Endalew et al, 2009b;Ruck et al, 2012). Each of these materials have their own merits and allow various aspects of canopy flows to be investigated faster, cheaper and in greater detail than a full-scale experimental campaign.…”