The general presumption at first: indicators must be orange.
But sometimes it is enough for them to flash orange. Sometimes they should even light up permanently. But what if they are supposed to do both and what if indicators are transparent instead of the usual orange?
We'll look into these unanswered questions here and deal with the transparent clear-glass indicator lenses on the Zs, which shouldn't actually exist. At least not everywhere. And yet they are there.