Image from: http://etc.usf.edu/clipart
- First floor = all of the bulky material is left showing on the facade
- First floor is separated from the second floor by a piano nobile
- Second floor = smoother material is shown by the lines between the materials are shown very dark
- Third floor is completely smooth and you cannot see any of the material
- Third floor is topped with heavy cornice that seems to crush the top floor
Image from: http://www.britannica.com/EBchecked/
Another building in Florence that follows this "rule" of using groves and stacks when possible is the Rucellai Palace. Although it does not use materials the same way as the Medici Palace does it still expresses this idea by using both stacks and groves on its facade. All three floors of the building use the same materials and repeat the same pattern as the floor before it. However, it mimics the use of piano nobiles to separate the first and second floor but then it also uses one to separate the second and third floor and then it mimics the same heavy cornice atop the structure just like the Medici Palace. These dividers between each floor create the stacks in the structure and then the pilasters on each floor create the groves.
A third building mentioned in the Ching textbook that uses this "rule" of using groves and stacks is the Piccolomini Palace in Pienza Italy. The form of this building follows more with the Rucellai Palace than it does with the Medici Palace. It has three floors that show the same amount of materiality as the floors in the Rucellai Palace and it also has the heavy cornice and the piano nobiles being used as a divider between each floor. This palace also has the same general idea with the pilasters as sen in the Rucellai but instead they change in size and materiality as they go up. The first floor is the biggest and shows the most materiality, the second floor it a little smaller and shows less materiality, and then the third floor has the smallest pilasters with no materiality. The Piccolomini and the Rucellai have the most in common but all three structures mimic one another it a lot of ways.
Information from: A Global History of Architecture; Ching, Jarzombek, and Prakash