Question

And as I sat there brooding on the old, unknown world, I thought of Gatsby's wonder when he first picked out the green light at the end of Daisy's dock.

Accepted Answer

(idiomatichttps://en.wiktionary.org/wiki/Appendix:Glossary#idiomatic) to detecthttps://en.wiktionary.org/wiki/detect using one's senses (sight, smell, hearing, touch, taste)

Sentence	And as I sat there brooding on the old, unknown world, I thought of Gatsby's wonder when he first picked out the green light at the end of Daisy's dock.
Definition	( idiomatic https://en.wiktionary.org/wiki/Appendix:Glossary#idiomatic ) to detect https://en.wiktionary.org/wiki/detect using one's senses (sight, smell, hearing, touch, taste)

I Sat Brooding Unknown World Thought Gatsby's Picked