 This complex consists of a series of interlinked structures corresponding to either a deep bronze (hence, "rust") or shiny white ("silver") hue, surrounding a variety of leafy courtyards.It has been complemented in 2005 by a new centerpiece, the brain-shaped Philological Library, designed by British architect Lord Norman Foster.With 43 ha and around 22,000 species of plants, the botanical garden of the FU in the east of Dahlem is one of the biggest of its kind.