> 
> Almost every summer he thinks: This is the best summer. But this summer, he knows, really is the best. **And not just the summer: the spring, the winter, the fall.** As he gets older, he is given, increasingly, to thinking of his life as a series of retrospectives, assessing each season as it passes as if it’s a vintage of wine, dividing years he’s just lived into historical eras: The Ambitious Years. The Insecure Years. The Glory Years. The Delusional Years. The Hopeful Years. 
> 
> 
> — Hanya Yanagihara, *A Little Life*
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> 
> 

I’ve read that you don’t have to, grammatically, write a complete sentence, and then write a colon.

In *And not just the summer: the spring, the winter, the fall.*, I don’t see a complete sentence, then a colon, and I don’t see a complete sentence used after the colon. There may not seem any utterances, which I think I’ve read may get used.

What may you call this, in grammar?