perfect!

Fribonacci Number
A numberical series where each number is the sum of the preceding two
numbers in the sequence. Fibonacci numbers are named after mathematician
Fibonacci, or Lenonard of Pisa who observed this sequence in the proportions of the
natural world. Numbers from the Fribonacci sequence are used in the golden section to
produce proportionally beautiful sizes.
Golden Section
The approximate 8:13 ratio that was though by the ancients to represent
infallibly beautiful proportions. The golden section forms the basis paper sizes due to the
harmonious proportions it provides, and its principles can be used as a mean
of achieving balanced designs.
Pictured is a Fribonacci spiral, which can be create by drawing quarter circles through a set of Fribonacci squares.
The ratio of the sides of Fribonacci squares is 8:13, which are two consecutive numbers in the Fribonacci sequence.

恕我愚昧，其實我也不是完全明白，大概是用理性及數據分析出來的美麗定義......