Reassembled from partial quotes in archived forum messages by: Drachefly
The author writes:
It seems that some people are confused about what's a flashback, flash-forward, main timeline, or guest art. Flashbacks are grey. Flashforwards are neon. Guest art... well, you'll have to work it out by context in that case.
Oh shoot. It looks like in the editing process I left the joke out of this strip. I'll edit it in later.