Which psychological principle do architects most commonly leverage when designing visible green features (like living walls or solar panels) in sustainable buildings?

Test your knowledge about how consumer psychology influences sustainable architectural design decisions. In today's environmentally conscious world, architects must consider not only the ecological impact of their designs but also how to appeal to consumers' growing environmental concerns while maintaining aesthetic appeal and functionality. This question explores an important psychological principle that has shaped modern sustainable architecture.

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The Diderot Effect - where acquiring one new ecological element creates a spiral of additional sustainable purchases
The Halo Effect - where visible green features create a positive impression that extends to perceptions of the entire building's sustainability
The IKEA Effect - where occupants value sustainable features more if they participated in their implementation or maintenance
The Decoy Effect - where moderate green features appear more attractive when positioned between minimal and extreme sustainability options