Two people return to a long-abandoned garden and find that a few of their old plants are still thriving amidst the weeds. One person says that some gardener must have been tending to the plants; the other says it’s all happenstance. The pair hide, watch and wait, but no gardener ever appears. But still the believer insists that there’s a gardener; the skeptic asks what the difference is between an invisible gardener and an imaginary one.