## Attributions of photos used
I used some photos which were licensed under the Creative Commons By Attr.  
Here are the attributions.

* [Photo of sandbags](http://flickr.com/photos/billadler/)
* [Photo of geek](http://flickr.com/photos/myhobosoul/)
* [Photo of elevator](http://flickr.com/photos/spine/)
* [Photo of projectors](http://flickr.com/photos/ebmorse/)
* [Photo of Steve Jobs](http://flickr.com/photos/rgarcia/)
* [Photo of Gene Kelly](http://flickr.com/photos/sprouseart/)
* [Photo of eyeball](http://flickr.com/photos/lotterymonkey/)
* [Photo of projector eyeball](http://flickr.com/photos/chrisbeach/)
* [Photo of rocketbike](http://flickr.com/photos/frielp/)
* [Photo of remote control](http://flickr.com/photos/aroberts/)
* [Photo of happy baby](http://flickr.com/photos/gregkidd/)