Koda

To be contemporary, one must mount an opposition to the old-fashioned.
To be old-fashioned, one must mount an opposition to the contemporary.

The joke is that what was once old-fashioned will soon become contemporary again, and the cycle will repeat itself.

To be modern, one must develop an appreciation of both the old-fashioned and the contemporary.

But while contemporaneity is brief and transitory; Modernity however, lasts.