Two mallard ducks make a triangular pattern of ripples as they chase each other in a tranquil pond. The male mallard has a distinguishing shiny green head, while the female mallard is more subdued, with speckled brown feathers.
photo-album.us/mallard-ducks.htm
A young female optometrist holds a pair of wire frame glasses in front of her, inviting her patient to try them on. As the patient fits the glasses to his or her head, the eye chart in back of the optometrist will come into focus.
eyeglass-lenses.com/optician.htm
A female teenager wearing a white cap and pink sleeveless tank holds an oversized tennis racquet in the ready position. Whether she is waiting to return a serve, or looking for a chance to pounce on a volley, this young woman exhibits serious focus.