I was out in the backyard near downtown Phoenix on Nov. 11, 2012 doing some sketching and listening to music on my iPhone when I looked up and heard and witnessed a Southwest airplane ascending in altitude in a Northeastern direction. This is usual since I live relatively near Phoenix Sky Harbor Airport. However, as I witness the airplane I looked over to the West and witness a white gleaming object traveling in an Eastern direction. It seemed that it changed shapes, from an oval, to disc, then finally to a cigar shape before it left at a high rate of speed in a Northern direction. During the duration of what I was witnessing did the object make any noise. At first, I thought it was a piece of trash up in the sky. Maybe a trash bag. However, it changed direction to head North and left at high rate of speed. I really felt that the unknown object in the sky was strange looking and nothing like I have seen before. I stopped my music and began to take photographs of the object with my iPhone 4 camera with the HRD option on. When it turned Northward it left at a higher rate of speed when I witnessed the object traveling from West to East. NOTE: Photos that are uploaded are at Max zoom on iPhone 4 camera. Object can be seen at the lower left of photos near the telephone pole.