We exposed a plate of nutrient agar to the complex microbial community of soil. After two days, several colonies of cells had grown on the plate. Using a sponge and a hand-made tool, we used the microbial colonies as an "ink" to stamp 25 fresh plates, creating unique "reproductions" of the original exposure as each stamped cell grew into a new colony.
A total of one hundred replica copies of the original exposure were made in four sets of twenty five prints. Each set was made from a single "inking" from the last plate of the previous set after two days of microbial growth.