Over the weekend, the “Kardashians” star posted photos from her daughter’s big day, which featured a “Rainbow Friends” theme.

Visually, certain colors in the rainbow spectrum seem to run on ... with saturation increasing from the center outward. The 'true' color (hue) is near the ring midway from the center.

Before its ruling concerning same-sex marriages, the Fukuoka District Court ordered visitors to remove or cover up anything showing rainbow colors, the symbol for the LGBT rights movement. The ...