In 1999 Cassandra Wedd, as Trustee of the Courtyard Farm Trust, commissioned two artists to create permanent artworks in disused marl pits on the farm, using materials relevant to the local environment.
John Sands who lives and works near Norwich, made the work Carstone Shale Wall and Boulder which can be found in an old marl pit on the track north-west of North Wood. He says:
"This work was produced reflecting the identity of the site and its locality. I have used carstone quarried locally for use in construction to identify with surrounding industry. The opposition of the wall and boulder reflects a positive nature for man and materials."
Martha Winter who lives and works near Cambridge, made Chalky Void (absence and presence) situated in another old marl pit, in North Wood. She describes it:
"The piece is embedded centrally into the ground of this near-perfect circular crater. The south side (or field) is set with chalk pebbles (or seeds) which over time will be dislodged and leave small craters. This sculpture aims to emphasise both the absence and presence of matter within the former marl pit. The overall design includes the relationship to its circular environment and plays with our spatial understanding of hemispheres, its outer and inner part referencing the surface of the earth and the fertility it contains."