Five structural columns are stack laminated and turned on the lathe. The profile of the seat supports draw directly from Victorian architecture, and these connect into the supporting columns via a traditional wide mortice and tenon joint. The bench seat slats and armrests are CNC-cut and hand finished, with the latter housed in grooves in the columns and jointed into position. The bench has been turned black by a process known as ‘ebonising’ – a chemical reaction whereby the tannins in the wood react with a mixture of household vinegar and iron filings, a nod to the use of iron in the original gasholders.