These two form a perfect pair.
There is Fons, Fons Sapientiae. The once very popular Flemish first name Fons, combined with the Latin word Wisdom, is a humorous reference to the university's motto 'Sedes Sapientiae' (the Seat of Wisdom). Fons is reading or studying a book while he is pouring a delicious Belgian beer into his head. The sculptor is Jef Claerbout.
The second statue, by sculptor René Rosseel, represents the scholar and humanist Erasmus (1467-1536) who was a lecturer at the University of Leuven but is mostly known as the author of Lof der Zotheid (the Praise of Folly), a critical essay on 16th century life and customs.