Many of the points in the structure of the honey-bee fit it for the
performance of its complex activities. Upon the head there are two large
compound eyes, used for near vision, and three small simple eyes, by
which objects at a distance can be perceived. There is a well-developed
sense of color, and flowers which specially lay themselves out to
attract bees are mostly of blue or purple hue. Bees have also a keen
sense of smell, which not only attracts them to fragrant flowers, but
also helps them to detect the presence of nectar.