Coneflower (Echinacea purpurea)

The swirls & whirls of the center disk contain multiple florets.
Their colors range from green to orange to brown.
The pink rays surround the disk & lighten up the garden.
Many insects come to feast on this flower's nectar.
Pictured above you can see an innocent hoverfly has come to visit.
It is harmless to humans & does not sting.
It is a beneficial insect. 
The adult feeds on flowers & can pollinate some.
Its larvae, which is its immature phase, is nearly invisible.
The larvae feeds on aphids, & by doing this it helps the gardener.