A bell pepper exhibiting "parthenocarpy"

My wife found this while preparing one of her favorite vegetables, and says she sees the phenomenon not infrequently.  As best I can tell from a quick search, it's called "internal proliferation" and is a form of parthenocarpy ("natural or artificially induced production of fruit without fertilization of ovules. The fruit is therefore seedless").  I'm not sure why the little pepper is green while the larger one is red - presumably from lack of sunlight as a result of the difference in their ages (tx, John).