light clock

[KFC]

This is probably a stupid question but where can you buy a light clock and is the light visible can you see it go up and down? Is a light clock something that you can buy or is it something that is used to explain time travel?

 

 

http://www.btinternet.com/~j.doyle/SR/sr7/sr7.htm

[insane_alien]

1. i don't think you can buy one and the losses would mean the light would be totall absorbed after only a few hundered bounces. the light would not be visible in any case(you don't see lasers unless you put something for it to scatter off of , or put your eye in its path NOT a smart idea if you like seeing) you could make one.