Usage patterns
〈物〉を拾うto pick up (a seashell)
I picked up seashells on the beach.
〈物〉を集めるto collect (seashells)
When I was a child, I loved collecting seashells.
〈物〉に耳を当てるto put one's ear to (a seashell) to listen
If you put your ear to a seashell, you feel like you can hear the sound of waves.