All eras come to an end. Clark recalls the old Data General commercial back in the '80s that had the following tagline: Don't show up for your battles with yesterday's armaments. The actual ad depicted an army of 19th-century soldiers facing off against a 20th-century military force. Data General itself has long since given up the ghost.

Sometimes it's tough to keep perspective as the market shifts around you. Look at Polaroid. They delivered an overpriced photo with a low-quality print that was considered amazing for its time. But today, Clark's phone can take a better picture and wirelessly send it to be printed for cheaper. Now Polaroid is closing factories that make its film and camera. Contrast Polaroid with Kodak. Kodak didn't stay married to film and did a good job transitioning to digital photography. In your own life, do you have tunnel vision like Polaroid? Stay aware as the ground shifts. Are you prepared?