Bath Room Waste materials are separated just below the seat. The urine is captured at ground level via a drainpipe, to be used as fertilizer, as it contains nitrogen, phosphorus, and potassium. The solids are captured via a series of stacked, donated wheelie bins, and will be used as fertilizer once left for 12 months.  Photo 14 of 26 in 10 Buildings We Love by Piers Taylor