"Higher ceilings allow the use indirect lighting, which is much healthier and reduces glare"

This quote by Helmut Jahn is referring to the significance of having greater ceilings in a room. Higher ceilings permit the use of indirect lighting, which is much healthier and lowers glare. Indirect lighting is a kind of lighting that is not straight in the line of sight of the individual in the room. This kind of lighting is helpful since it reduces the amount of glare that can be caused by direct lighting. Additionally, indirect lighting is much healthier for the eyes since it does not cause as much pressure on the eyes. This kind of lighting also helps to produce a more comfy environment in the space. Overall, this quote is emphasizing the value of having greater ceilings in a room in order to benefit from indirect lighting, which is much healthier and decreases glare.