Galleries: Two sculptors are given their due

Two much-admired Philadelphia sculptors are being remembered in eloquent exhibitions that should not be missed. Robinson Fredenthal's enormous, geometric steel sculptures are ubiquitous in this city if you know where to look: in the lobby and outdoor plaza of the SEPTA building at 1234 Market St.; in a pedestrian walkway behind the Wells Fargo Bank on Market between Fourth and Fifth Streets; at Eighth and Spring Garden; and on Woodland Walk, near Walnut and 34th.