A former office building with low ceiling heights, a cluttered ground plan and inadequate lighting: it was barely conceivable at the outset of the modernisation process that here one day an expansive, brightly lit ophthalmologist’s practice would emerge. Yet the historical edifice on Lake Zürich can breathe again: with the aid of shadow gaps, a visible separation arises between the old material and new fixtures. Hence, in the interplay with the subtle lighting, an effect of both airiness and meditative calm is created. Thanks to a mirror attached to the lowest area of the ceiling, the passage between the reception and treatment rooms seems to expand upwards.