CD signalling

A mirror or a CD disk can be used to signal in an emergency or as a fun activity on camp.

Two fingers are used (as shown in the image) to aim the signal and by flashing the disk it is possible to send a message using Morse Code.

Supplies you need:
CD Disk

See who to make mirror signaling in these videos:
http://www.youtube.com/watch?v=Lb4-C7Nekh0
http://www.youtube.com/watch?v=e3YQ4EhEpJY