The Warsaw University Library roof garden was designed by the landscape architect Irena Bajerska and opened in 2002. The area is 1 hectare and it has beautiful views of the River Vistula and the city of Warsaw. There are symbolic themes and the planting is lush on a 300mm layer of soil. The library building has green walls and large wall teblets with mathematical formulas, musical scores and famous quotations in various alphabets. It is an excellent example of how publicly accessible greensapce can be made at roof level.