Generate a full detail guide on creating a 'happy space' at home. The guide should be creative and practical. It must include sections on: 1. The psychology of how our environment impacts our mood. 2. The role of light, color, and decluttering. 3. A step-by-step guide to creating a small 'sanctuary' or 'calm corner' in any home. 4. Ideas for incorporating items that bring you joy (e.g., photos, plants, art). Please include a supportive disclaimer.