The lead designer at Mailchimp wrote a really good book on this subject (designing for emotion): http://www.abookapart.com/products/designing-for-emotion http:/

The lead designer at Mailchimp wrote a really good book on this subject (designing for emotion): http://www.abookapart.com/products/designing-for-emotion http://www.abookapart.com/products/designing-for-emotion