... and a grid of more windows behind the slats (barely perceptible here) that allows light to filter through the slats. Here the slats are a second, outer wall that helps this glass volume relate to the traditional house. They also enable different appearances outside (where they look like random pixels) ...
slatwall can be used to cover existing siding, providing bold horizontal lines and the warmth of wood. the math here, was immaculately done in advance!