Andyfan is screening at a 1m x 1m test unit. She is from Beijng, China.
Manon, from Lyon, France, uses a trowel to level out the base of a test unit.
Zoey takes a break from straightening the walls of a test unit. She is also from Beijing.
Anais removes dirt from the bottom of a test unit. She is another volunteer from Lyon.
Colin pours dirt into a screening bucket. He hails from Montpellier, France.