Stewart Gibb, 7, from Vienna, Va., keeps his eyes on Dave Krack, who was instructing him and others how to ride a unicycle, during OpenStreetsPGH, at a booth in front of PNC Park on Federal Street on Sunday. Stewart was visiting Pittsburgh with his family. (Photo by Larry Roberts/Post-Gazette) #Pittsburgh #PGH #412 #OpenStreets #OpenStreetsPGH #Unicycle #PGPhotos