The building opposite produced these reflections on the front wing of this Opel Mokka.
Notice the red band which forms an ellipse around the top of the wheel arch flare and then runs up to the a-pillar. It’s quite a complex area. It would be even clearer if the red stripe on the building emitted light instead of reflecting it. You seldom see reflections like this in the street as there is so much ‘noise’ in the surroundings.
There was a huge red stripe on a big plain background that meant I could read the Mokka’s form using the path or contour traced by the red line. Paint shops and styling studios have evenly spaced strip lights overhead to deliberately achieve this effect so as to help see surface irregularities. CAD programmes have high-lights analysis tools to reveal curvature characteristics.
In the Mokka’s case the flatness of the metal around the mirror shows where variation in the paint and steel pressing has a greater impact than the crown in the panel. The highlights are wobbly.