throughout the republic , bluestone was a mineral which was regaining much of its former glory as a building material , partly due to a resurgence in nostalgia over architecture from previous centuries , and also in part because those most nostalgic about old-timey building design were able to put forth the capital to finance a revival of that classical bluestone look whicheven at the height of its popularityhad been impugned by now long-dead modernists as being representative of all those institutions of aesthetics , once revered , which had over time degraded to a state of stodgy obsolescence .