A central spine staircase is built around a single structural spine that runs through the center of the stairs. Each tread is either welded or bolted to this spine, creating a striking floating effect. This type of staircase is commonly used in high-end residential and commercial projects. The central spine staircase stands out because it offers design flexibility. Treads can be ma... https://visionarystairways.co.uk/central-spine-staircase-design-c/