"I guess... the roots can't go anywhere." Trees can't look, but they can feel, probably, right? That's what the roots are for. Maybe.

To the boy's question, Yoshio pauses, considering how to answer. He reaches up, taps the glass in front of a particularly pretty cherry specimen, in full bloom. It's so pink that it doesn't look real. "It's an art thing, I think." Nailed it. Despite his shoddy explanation, this one is particularly artful, or at least he thinks so.