By Greg Bishop With the tower looming over the world championships in Eugene, one writer’s obsession with the out-of-place structure turned into an upset like many of the races held below. EUGENE, Ore. — This tower, well, it towers. It rises and rises—and rises and rises. It soars skyward, until necks scream from bending back too far. It stands sentry, looming over the frenzy that is a world championships track meet unfolding down below. This tower, all 10 stories and 188 feet (plus 8 inches) of it, is almost unfathomable. It gleams on sunny afternoons. At night, it can be lit up, like the Emp…