Star, Branch, Spiral, Fan: Learn to Draw from Nature's Perfect Design Structures | Yellena James
"Nature's design magic is a balancing act found in its perfect ratios. The sections of this sketchbook - Star, Branch, Spiral, and Fan - focus on four of those disceptively simple design principles and why they work"--
Star, Branch, Spiral, Fan: Learn to Draw from Nature's Perfect Design Structures | 
