British Airways tries monitoring how you feel in a plane with the happiness blanket

I found an interesting trial by British Airways.

It tries monitoring how passengers feel in its planes by using special blankets.
When the passengers are relax, the blankets turn to blue.
On the other hand, when the passengers are tense, the blankets turn to red.

I think it is unique and interesting, but some people consider it is intrusive.

How do you think about it?
Check the article which is linked below.

http://edition.cnn.com/2014/06/30/travel/happiness-blanket-british-air/index.html?iref=allsearch