In the Golden Dawn system of magic, colors that produce a flashing or “strove” effect in the eyes of a view…If two colors are chosen so that each is the other’s exact opposite, and the two are placed side by side, each will appear to pulse with the other after a short period of concentrated gaze. The Golden Dawn knowledge lectures stated that this effect was associated with a stirring up of the etheric energy, and flashing colors were therefore used in consecrated working tools and talismans as a source of additional energy.