Sunflower

"The florets within the sunflower's cluster are arranged in a spiral pattern. Typically each floret is oriented toward the next by approximately the golden angle, 137.5°, producing a pattern of interconnecting spirals where the number of left spirals and the number of right spirals are successive Fibonacci numbers."(Wikipedia) 

Unfortunately you won't find any more artworks with sunflowers on Exhibition "Flowers"! But anyway, you can just see many other kinds of flowers in original oil paintings!

Also you can order similar artwork.