Barker Creek’s Clouds are not Spheres Poster is one of their many inspirational posters. This fun and intriguing design is sure to bring attention in any classroom or home! Poster Reads “Clouds are not spheres, Mountains are not cones, Coastlines are not circles, and Bark is not smooth, nor, does lightning travel in a straight line.” ~Benoit Mandelbrot, The Fractal Geometry of Nature. This poster measures 13 3/8″ wide x 19″ high and is printed on sturdy 12pt cardstock. Coordinating products available: Search Barker Creek Fractals.