Is as though we slip into a worm-hole in the fabric of time and space, travel into the past and then back again
to the present in the same instant. That morning, swim-
ming, I remembered a day in late September the year
45 before, the last day my swiin team had use of an out-
door pool. All summer long my teammates and I swam
under an open sky. After this day we would spend the
rest of the season in a dank and moldy indoor pool.
What is the main idea of this paragraph?