Koivisto and colleagues share that “Exposure to natural environments has positive psychological effects. These effects have been explained from an evolutionary perspective, emphasizing humans’ innate preference for natural stimuli. . . . The source of an ambiguous sound was attributed to either nature (waterfall) or industry (factory). The results suggested that the participants’ subjective experiences were more pleasant and relaxed when the sound was attributed to nature than to industry. The influence of source attribution was also reflected in physiological…