Riddle: I don't fly, yet I change the sky, in the dark I work…

Riddle

i-swim-with-the-sky-yet-travel-below-i-signal-the-end

Riddle

i-wear-a-mask-both-day-and-night-i-fly-in-silence-out

Riddle

i-wear-my-home-upon-my-back-no-luggage-do-i-lack-across

Riddle

i-move-without-legs-i-strike-without-arms-you-may-hear

Riddle

i-build-my-home-with-no-doors-or-locks-my-neighbors-do