In 1850 the art collector Gian Giacomo Poldi Pezzoli began the decoration of his own apartment within the family palace.
The result was a series of rooms inspired to various artistic and decorative styles of the past (Baroque, Medieval period, Early Renaissance, Rococo), designed and decorated by some of the most innovative artists of the time.

Each environment was conceived to contain objects belonging to the epoch of reference.
Thus, Eighteenth century porcelains found their place in the Rococo-style room (now called the Stucco Room), while the Flemish "Polyptych" was an integral part of the furnishing of the Black Room, where a Sixteenth century Northern-European environment was re-created.
Likewise, Gothic golden jewels were placed in the Medieval study (now the Dante Study), and Baroque statues around the Antique Staircase.
Although the collocation of the art objects mainly followed such historical strategy, their position also depended upon the collector's personal taste.
(I have stolen only few photos, I'm sorry)