Okay, now let's get to that stained glass fireplace screen. One Solomons Secret Review of the nice things about stained glass is the amount of Black used. "Black stained glass? Never heard of it!" you say. Not glass, but the lead lines between the glass pieces covered in flux gives it a Black patina. It's not overt but it definitely encases each piece of the firescreen in a Black outline. When you have a thin Black line surrounding a vivid color, the psyche picks up boundaries. Boundaries are limits or guides. They stop the flow of energy to allow other energy to work its magic.
Black boundaries magnify the color they outline. For example if you have Green outlined by Black, the psychological suggestion is supreme confidence in who you are minus the ego. Red outlined in Black suggests unstoppable passion. Each of the colors has a psychological reaction and when outlined with Black the reactions are increased.
When you cluster colors together the result is almost too much for your eyes to take in, so the mind does what I call a "shallow sweep"; it takes the easiest route to handle. Usually it will choose the most positive aspect of each color without focusing on just any one aspect. It will blend them into feelings of enchantment and pleasure. Think of a rainbow, a mandarinfish, a parrot, a bird of paradise flower, a peacock, all things with multiple colors; what is the feeling you get? Wonder! Amazement!
Now outline them in Black. And presto, you get tremendous feelings of awe and delight and you instantly want to share your experience. The colors have been forced into prominence by the Black boundaries. Black is the perfect boundary color because in essence it says "resistance to individuality" indicating that all colors are needed in tandem or balance to convey delight.