Sorry if this is answered somewhere else but im super curious if this is just a fun Easter egg or what. In the mailbox, if you tap on the little envelope icon, it flips around, and then flips back to an envelope when you tap it again. The first 3 or 4 times I did it it was an empty circle in place of the icon, but then it started showing another icon of a comet or some sort of smaller sphere surrounded by flame or lens flare. It switches back as soon as I tap it or elsewhere on the screen, so I feel like it's not changing any kind of functionality? Very curious if this has a meaning or if it's just cool. I've included a picture.