This technique might be of interest to some so I've decided to post it. I've started using an inexpensive shaving mirror to reflect the business side of my box joint jig on the router table so that I can monitor the action without leaning forward over the board being machined. It has greatly improved my accuracy and, because I can see where my fingers are at all times, my safety. This idea is not original with me, but I can't remember where I first saw it.