Interested in how the human eye perceives birds in flight, Spanish photographer Xavi Bou sought to examine this motion in a way that avoided the blur that comes with creating an image with a long exposure. To do this, he turned to chronophotography, an 150-year-old technique that combines many photographs taken in succession to imitate movement. Unlike this pre-cinema strategy however, Bou uses the power of Photoshop to bring all of his images together into one, making each bird appear like…