@skye you can't see lasers through the air without particles for the light to reflect off, so you haze the room with a haze machine ("hazer" for short). the machine just pumps propylene glycol, like you find in vape fluid, onto a hotplate and blows the vapour out the front with a fan. you usually try to adjust the output to keep the haze level consistent, but it's kinda tricky to get it exactly right in large rooms and it's easy to get distracted while filming and leave it turned up too high.