An expensive juicer, that is not meant for making juice?
What is going on here? Score zero for behavioural design! And yet, it is one of the most famous product designs ever. As Don Norman explain in his book Emotional Design, Starck’s juicer may be useless in its function, but it scores one hundred for its visceral and reflective appeal.
Or as Khaslavsky and Shedroff suggest; the juicer makes an emotional promise, it continually fulfils the promise, and ends the experience in a memorable way.
To learn more about the importance of emotions in product design, check Don Norman’s book Emotional Design. It is easy, yet very informative reading on the topic, full of useful case studies and examples.