Palazzo Rucellai

The front facade
Alberti designed a rational "skin" for this palace--a type of "screen" architecture in which the classical elements provide no support structure. All three stories are of equal height with flat pilasters supporting a classical entablature. Imitating in part the Colosseum, the capitals vary from Tuscan (bottom story), to Alberti's own invention (acanthus leaves with a center palmette), to Corinthian on the top story.
 
The window of the second story (left)