Expanded polystyrene (EPS) was discovered in 1839 in Berlin and became a widely used material in airplanes manufactured for World War II due to its extremely low density. It is this characteristic that makes it a suitable material for thermal and acoustic insulation, often specified in buildings, but also widely used in packaging. A rigid cellular plastic, it is the result of polymerizing styrene in water, whose end product are expandable beads that have a diameter of up to 3 millimeters. Unfortunately though, this material takes more than 500 years to decompose and, in the process, leaches harmful chemicals into the environment. Recycling is possible, but it is complex and costly. This means that most of the Styrofoam produced to date still remains on the planet, taking up valuable space in landfills, or worse, broken into tiny pieces and interfering with ocean life. “Decomposition Farm: Stairway” is a temporary installation that offers a possible solution to the environmental issues related to construction waste in the architectural field.