The Golden Ratio. This geometrical representation has been in existence since the last 2400 years or more, and has given birth to The Golden Rectangle, a four-sided shape bearing golden proportions! Coming to buildings, we all have heard of Parthenon, the one famous temple located on the Athenian Acropolis of Greece. The facades and many elements therein of this 2464 years old temple can be circumscribed by the Golden Rectangle, providing clear proof that mathematics was actively used in architecture long before we existed.