Site-specific art is artwork created to exist in a certain place. Typically, the artist takes the location into account while planning and creating the artwork. (Wikipedia) and generally architectural glass art and architectural stained glass are, by default and in different degrees, site specific, just by fitting and acknowledging a given opening or space into which it is installed. As a result they are bespoke, made to order.
Even the most monochrome and minimalist approach to a site and its architectural layout in fact embodies a less obvious multifaceted approach to the notion of the site-specific.