Couldn’t you have a machine that turns the laser on and off at a super speed so that the laser beam will only reach a few feet. You could even make a toy lightsaber using that method.,(reply>), How.... How do you think light works? While lasers may be a continuous "beam" it's actually a whole lotta little particle wave things that move really fast, they don't just stop when the light is turned off, it just stops making new ones,(reply>), &gt; Toy<br>&gt; Lightsaber