Whale in a Fishbowl

Wednesday is a whale who lives in a fishbowl smack dab in the middle of a city - it's the only home she's ever known. Cars whizz around her and people hurry past; even the sun and moon circle above. But if she leaps high enough out of her bowl, Wednesday can see it: a calm bit of blue off in the distance. When a girl in a paisley dress tells Wednesday 'You belong in the sea', the whale starts to wonder, what is the sea?