Declare your affection for math on your car or in your classroom. Based on the popular I Heart Posters, this bumper sticker shows how math is all around us. Fibonacci numbers occur often in nature, in particular in phyllotaxy, the study of leaf arrangement on a stem. The spirals on sunflower seed heads, on pineapples, and in pine cones are invariably Fibonacci numbers or multiples of Fibonacci numbers. 3" x 7" with adhesive backing.