On stage at the Aurora Fox Arts Center sits the house at 1839 Wylie Avenue in Pittsburgh’s polyglot Hill District. The year is 1904. In that slat-wooden home, its front door opens on a wide room where guests plop down for food but also for talk. There, an old, old, old woman gently but firmly reigns. Playwright August Wilson named the cultural matriarch in “Gem of the Ocean” Aunt Ester (and she will appear in three more of his plays).