I'm helping Andre Liederhosen train for the Tour de France. Andre wants to get some exact measurements of the distance he rides during training. He knows I'm a surveyor, so asked if I'd help. I said sure. I took a piece of reflective tape and stuck it to Andre's spine just below the neck. Then I set up my laser and aimed it at the tape. Everything was working and I was able to measure the distance from the tape to the starting point. I decided to keep the laser aimed at the tape continuously. As long as Andre kept riding away from me I could take all the measurements I needed. Andre started pedaling and I started measureing. I was only interested in Andre's distance from the begining point. I watched that number get bigger and bigger and bigger and smaller and smaller.??? I checked the laser, it was still hitting Andre right in the middle of his back. What happened?