The context of the following conversation is Sydney found seashells in the sand, and organized them into a bunch of straight lines.:
Sydney says Last weekend my parents took us to a beach house..
The friend responds It must have been so nice to be at the ocean, did you go swimming..
Sydney responds I did, and we built sand castles, and went fishing.  I even found a bunch of seashells in the sand..
The friend responds Seashells are so pretty, did you keep them?.
Sydney responds A few, I organized them into straight lines in the sand based on type and size, I was pretending I was a marine biologist..
The friend responds How much fun, I wish I had been there to play with you, I want to be a marine biologist when I grow up..