About our logo:

The Keystone Companies’ logo is based on the Renaissance plan of the ideal city. Antonio Averlino (c 1400-69), known as Filarete, was an architect and the author of several plans for ideal cities that were as much an expression of Renaissance philosophy as of practical design. In the proposal for the ideal city “Sforzinda” that he devised for his patron Francesco Sforza, the Duke of Milan (F. Sforza), two squares intersect within a circle to create the ground plan.

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