I'd like to have a running buffer of frames that I can "tap" to use as a visual echo, much like an audio tape delay. So every time I write a frame, I'd like to save it in memory as well as display it so that they can be called up N frames later and displayed (with diminished opacity) again.

My plan right now is to use an array of PGraphics objects... don't see any reason it wouldn't work, but I'd like to make sure there isn't some syntactic sugar or something which would make things easier. I'd imagine someone has done this kind of thing before... does anyone have examples (both for code and aesthetic inspiration)?