Staircase, Metal Tread, Wood Tread, and Concrete Tread Perforated black metal has also been used in the design of the staircase. 

  Photo 8 of 9 in A Dark Sydney Home Finds Light With a Unifying Expansion

A Dark Sydney Home Finds Light With a Unifying Expansion

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Perforated black metal has also been used in the design of the staircase.