Steven Universe is a beautifully frustrating show. One gets just enough little bits and pieces of worldbuilding to sustain a convincing sense of a much larger universe outside the margins of the narrative—it's a bit like the original Star Wars in that regard. But so many of the bits and pieces are one-off occurrences, confined to single episodes, that it's hard not to suspect that the writers were kinda...making it up as they went along.
Like this. Absolutely stunning: Steven's trying to free Lapis Lazuli's gem and a magic circle spontaneously forms round him, drawing seawater into itself. Do you ever see anything like this, in any other episode? I suppose one could rationalize it as an indirect manifestation of Lapis's unusual powers, though.
~Chara