The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
The Empty Air is an interactive soundwalk of Philadelphia's Rittenhouse Square Park, created by The Mural and the Mint. Go to Rittenhouse Square, launch the app, put on your headphones, put your phone away and go for a stroll. Each part of the park has its own disctinctive audio experience. You must be in Rittenhouse Square to experience this app. Continued use of GPS running in the background can dramatically decrease battery life.