The Neues Museum (New Museum, now part of the main building of the University) was built in 1844 by Georg Adolph Demmler to be used as science building. The front façade shows therefor four portraits of international scientist, referring to the international orientation of the university:
Galileo Galilei (Pisa 1564 - Arcetri 1642), Italian physicist, mathematician, astronomer and philosopher
René Descartes (La Haye en Touraine (at present Descartes) 1596 - Stockholm 1650), French philosopher and writer who spent most of his adult life in the Dutch Republic (Wikipedia).
Carl von Linné (Linnaeus) (Råshult near Älmhult 1707 - Hammarby estate, Uppsala 1778), Swedish botanist, physician, and zoologist, who laid the foundations for the modern scheme of binomial nomenclature
Otto von Guericke (1602-1686) (Magdeburg 1602 - Hamburg 1686), German scientist, inventor, and politician, known int.al. for the establishment of the physics of vacuums (the famous Magdeburg hemispheres) (Wikipedia).