Strange Shapes Streak Across The Sky,

but what are they?

 birds, these photographs were taken by Spanish photographer Xavi Bou,

 the images are inspired by chronophotography, a Victorian era photography method that combined multiple images to create movement, and edited digitally in Photoshop,

 the layered images appear like floating double helixes or fringed ribbon depending on the size and wingspan of each bird, and create elegant gestures as they criss-cross against the blue sky,

 the photographer tracks and records the flight patterns of birds, combining their repetitive movements into elongated shapes that twist through the sky for his series Ornitographies,

 recently Bou traveled to Iceland where he captured new species of birds set against a dramatically different landscape than his previous images,

 Bou has also recently visited Barcelona to watch pigeons race across the city, 

 and Tarifa, Spain to experience thousands of birds from all over Europe cross the sea towards Africa,

You can see more of his multi-shot avian images on his website and Instagram, what a totally different way to view birds in flight.