According to retail psychology research, which natural element in store design has shown the greatest impact on increasing customer dwell time and average purchase value?

The natural world is increasingly influencing retail design and consumer psychology. Biophilic retail—incorporating natural elements into store environments—has emerged as a powerful strategy for enhancing customer experience and driving sales. Research shows that consumers respond positively to natural elements in retail spaces, but do you know which specific biophilic feature has been proven most effective in increasing dwell time and purchase behavior?

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Living green walls
Natural lighting from skylights and windows
Water features like fountains or aquariums
Exposed natural wood furnishings and fixtures