What is the Black Cat Alley? It’s soon to be an amazing street art destination on the East Side of Milwaukee. Owned by the East Side B.I.D. and managed by wallpapered.city, it’s going to be a huge open-air art gallery full of murals like this city’s never seen. At right, the iconic 60-foot-wide “glitch frog” piece by European artist MTO, our first visiting artist.