Rachel Carson's quote does ring true for me, as I 've realized, recently, not upon completing 90 minutes of outside time, that being in nature is like going somewhere fun and having a good time, and going somewhere fun and having a good time is super important for spiritually and emotionally developing. When a culture spends most of its time indoors, the implication is that the culture is missing out on going somewhere fun and having a good time, which would mean that those cultures would lack a spirituality that others would.