Fractal patterns in nature and art are aesthetically pleasing and stress-reducing
(PHYSorg.com Mathematics)

Humans are visual creatures. Objects we call `beautiful` or `aesthetic` are a crucial part of our humanity. Even the oldest known examples of rock and cave art served aesthetic rather than utilitarian roles. Although aesthetics is often regarded as an ill-defined vague quality, research groups like mine are using sophisticated techniques to quantify it - and its impact on the observer.