John Henry Fabre, the great French naturalist, conducted a most unusual experiment with some Processionary Caterpillars. These caterpillars blindly follow the one in front of them. Hence, the name. Fabre carefully arranged them in a circle around the rim of a flower pot. So that the lead caterpillar actually touched the last one., making a complete circle. In the center of the flower pot he put pine needles, which is food for the Processionary Caterpillar. The caterpillars started around this circular flower pot. Around and around they went, hour after hour, day after day, night after night. For seven full days and seven full nights they went around the flower pot. Finally, they dropped dead of starvation and exhaustion. With an abundance of food less that six inches away, they literally started to death, because they confused activity with accomplishment.
Zig Ziglar, See You at the Top