Riddle: I'm a sequence with no beginning or end, in which each…

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i-fly-without-wings-i-cry-without-eyes-whenever-i-go

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i-have-keys-but-open-no-locks-i-have-spaces-but-no-room

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i-start-with-a-bang-im-never-the-same-predict-my-next

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im-seen-once-in-a-twinkle-and-twice-in-a-pattern-but

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i-move-in-a-sequence-one-to-seven-then-back-to-one-a-loop-thats-never-done-what-