The golden ratio was often used in the design of Greek and Roman architecture.

Sacred geometry is geometry

that is sacred to the observer or discoverer. This meaning is sometimes
described as being the language of the God of the religion of the
people who discovered or used it. Sacred geometry can be described as
attributing a religious or cultural value to the graphical
representation of the mathematical relationships and the design of the
man-made objects that symbolize or represent these mathematical

Making your first Fibonacci spiral: First, get some graph paper, and with a pencil,
draw two parallel lines 13 squares long. One on top of the other; look at
the picture below; the two lines are the top and bottom of the rectangle.
Next, join the ends of the two lines to make a rectangle. Next, you draw a
line at the eighth square to make a square 8 boxes long and eight boxes
high.  The box you just made is box eight below. Next, in the upper
right-hand corner, draw another square 5 boxes long by five boxes high,
that will be square number 5 in the picture below. Then, you draw
another square, three boxes by three boxes, where the number 3 box is below. Next,
you draw a square of 2 boxes by two boxes like the one below. Next two by 2,
and the next one by 1.

fibonacciblocks.png (2092 bytes)

Then, you draw your spiral, which will look
something like this.

fibonacciblocks2.jpg (11942 bytes)