Because he's looking for things to do.
Explanation:
Infinitive phrases include infinitives. ... Examples include, “to walk,” “to read,” or “to eat.” Infinitives can act as nouns, adjectives, or adverbs. As a noun, they might act as the subject of the sentence. For example, “To travel is the only thing on her mind.” As an adjective, they'll modify a noun.
"He rolls them with delighted motion,
Joy-tides swell their mimic ocean."
