Enlarge / It's never explained what this collection of app icons quite represents. A disorganized app you tossed together by sideloading? A face that's frowning because it's rolling down a bar held up by app icons? It's weird, but not quite evocative. (credit: linuxct/hydra) You might sideload an Android app, or manually install its APK package, if you're using a custom version of Android that doesn't include Google's Play Store.