LED cube 4x4x4 / Arduino

Thank you for your interest to my second project with Arduino. 64 blue LEDs are controlled by an Arduino uno. Unfortunately one LED is not working. Have you already found it ? ;-) Also see my first project "Cannot Look Away". http://www.youtube.com/watch?v=EtI3cC4DV5Y Thanks to galileo-7 for this interesting kit, not so easy to assemble but easy to control using an Arduino. http://www.galileo-7.com/?pid=20015630