__Harmonic structures__ are shapes derived from combining a sequence of __Fibonacci ratios__ to form specific and precise shapes.

__Fibonacci ratios__ are a series of ratios derived from a number series called the __Fibonacci number sequence__.

The __Fibonacci numbers sequence__ is derived from the __Fibonacci number series__ identified by mathematician Leonardo Fibonacci in the 13th century.

In mathematics, the Fibonacci numbers are the numbers in the following sequence:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144...

This is called the __Fibonacci number sequence__, and it is characterised by the fact that every number after the first two is the sum of the two preceding ones.

The Fibonacci sequence is not as important as the mathematical relationships between the numbers in the series, expressed as ratios.

These ratios are the __Fibonacci ratios__.