The double Fibonacci spiral could be "double sized" : (5,8) appearing as (10,16).

fibonacci spiral

Fibonacci spiral in pine cone, pictures enjoy learning how the world works.

calendula arvensis

Calendula arvensis

golden ratio pine cone

Picture size (324x200) is an approximation of golden ratio.

Alder Fibonacci and sunflower pineapples

Alder, Alnus rhombifolia.

The golden spiral (Fibonacci numbers) can be seen in the seedheads of sunflowers elegant spirals of a pine cone or a pineapple.

Fibonacci and anthemis flower

All naturalistic artworks should learn to read carefully in the book of nature; that is the secret!

Dahlia Fibonacci

διπλοῦν ὁρῶσιν οἱ μαθόντες γράμματα

Those who know the letters see double

Pythagoras

golden ratio pine cone

Beauty must be natural and unadorned; beautiful things are stress relieving.

Theodor W. Adorno

golden ratio pine cone

Art has complicated roots that make it difficult to fix.

pineapple golen ratio

The ratios of successive Fibonacci numbers approaches the golden ratio as approaches infinity, as first proved in 1753.