Basketball

I I bounce up and down, but never leave the ground. I live both indoor and outdoor, but I am sure you have never played with me. You may wonder, what am I? Well I am a basket ball's shadow. I am filled with air, but always stay empty. I am never played with as I cannot be lifted, but my object is played with by all ages, genders, and races! I am forgotten in a game and forgotten regularly. There are photos of me, but what happens after the photographers finsh with their photos? Nothing. I am either left there or my object participates in a game or two. I am as common as a sneeze, and as popular as an ant. My object is far luckier than me. I may be chased after, but it is not me they want. I am partial and complete darkness. I can not deflate, but I can never be full.