How big should a garden be for serving the needs, soothing the psyche of a human being? A desert is a grain of sand and a grain of sand a desert. Remember Kahlil Gibran? Or how much land does a man need? Remember Tolstoy? You will occasionally find little natural Zen gardens like this one in rock crevices to remind you about scale issues.
Need, want and greed are sometimes just points on a linear scale.