The lighting distribution on an unstructured wall becomes a dominant feature.

The same lighting distribution on a structured wall is interpreted as background and not perceived.

Light distribution that is not aligned with the architectural structure of the space is perceived as disturbing patterns that do not relate to the space.

Irregular or uneven luminances can result in confusing lighting situations. This is evident, for example, when luminous patterns created on the walls bear no relation to the architecture. The observer's attention is drawn to a luminous pattern that cannot be explained through the properties of the wall, nor as an important feature of the lighting. If luminance patterns are irregular, they should, therefore, always be aligned with the architecture.