This week, Patti has chosen Street Art as the subject for the Lens-Artists Photo Challenge so I decided to revisit my trip to downtown Chicago for the Air & Water Show last summer. There is always so much to see in the city and you can bet you will come across some street art in one form or another. Thirty-three of these brightly-painted police dogs, placed mostly along the Magnificent Mile, helped to raise money for the Chicago Police Memorial Foundation.