Actually, having someone sit at their desk while I continued to shoot closer and closer to their face was probably the most fun of the entire project.

I tried some basic calculations, but as you could guess with a nerf dart, building HVAC, and all the other things going on it wound up being faster and easier (and again, more fun) just shooting until I was on target a couple of times.

After the first few desks it was pretty easy to get close on the first shot because you could generally know that 4ft left or right was about an adjustment value of +/- whatever from the last coordinate you had dialed in.