It might seem antithetical to common practice that lighting would be used to announce, indeed summarize, the competence, skills, and technological precision of a private ophthalmology clinic. But, in their redesign for a lobby at the Institute of Ocular Microsurgery (IMO) in Madrid, local firm gon architects employed a strategy of illumination for the street-level reception-cum-waiting area of the facility’s 2010 building that is strong yet surprisingly tranquil. Rather than dazzling patients as they enter, the architects’ scheme manages to welcome them with visual comfort. This is because, once inside, one no longer sees the light, one senses it.