Mused

He mused about the complexities of human relationships while people-watching at the park.

He mused about the mysteries of the ocean while scuba diving.

He mused about the mysteries of the universe while stargazing in his backyard.

She mused about her future career while gazing at the night sky.

"The professor mused over the complexities of the theory."

She mused at the ridiculous costumes in the carnival parade.