Samuel Hughes(@SCP_Hughes):Marble has a property called 'subsurface scattering', meaning that sunlight not only illumines its surface, but a millimetre or so of its depth. This yields an effect of softness and luminosity. In the few cities in which architectural marble is common, the aggregate effect of this is astonishing. This is true above all in Washington DC. I discuss this and other impressions in my travel diary from Washington DC:

Samuel Hughes

@SCP_Hughes

Editor @WorksInProgMag | Fellow @CPSThinkTank & @createstreets | Interested in architecture & urbanism | Views my own

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Samuel Hughes@SCP_Hughes

2026.05.26 08:47

Marble has a property called 'subsurface scattering', meaning that sunlight not only illumines its surface, but a millimetre or so of its depth. This yields an effect of softness and luminosity. In the few cities in which architectural marble is common, the aggregate effect of this is astonishing. This is true above all in Washington DC. I discuss this and other impressions in my travel diary from Washington DC:

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