ART in concept Designs

I found some interesting concept designs of many different things. Imagination is like the spark that can start an entire forest in fire (but in a positive way) and as I look at these concept designs, I always wonder if there is a limit to imagination and if there is, when will we reach that dead end.

concept psp design with bendable screen

from http://www.walyou.com/blog/2008/10/18/new-psp-2-concept-design-with-scrolling-oled-screen/

concept nail watch design

from http://www.slashgear.com/the-tx54-concept-design-is-not-for-nail-biters-1612604/

concept watch design 

from http://gizmodo.com/231961/hourglass-watch-concept-design

Ford concept design

from http://www.carbodydesign.com/archive/2009/03/05-ford-iosis-max-concept/

BMW concept design 

from http://www.impactlab.net/2008/08/12/2015-bmw-concept-design/

Boeing Concept design

from http://community.warplanes.com/2010/07/01/designs-for-future-supersonic-airliner-revealed/