The artwork by Jürg Stäuble, created in 1982 and located in the entrance hall of a municipal building in Basel, transforms a static administrative space into a site of subtle perceptual engagement. Through a composition of small, alternating triangles set flush into the plaster, the work introduces a dynamic visual rhythm. The use of mirrored and painted surfaces in graphite and black plays with light and reflection, while the triangles' orientations follow a curved grid that suggests movement. This approach, grounded in Minimal Art's repetition, deliberately avoids a fixed pattern, inviting viewers to experience a sense of ordered surprise within the rigid architecture of the public hall.