Sage is one of the essential herbs and has medicinal properties, according to research. Sage is good for clarity, focus, and can help with digestion. It's also an anti-oxidant, as are most green plants. The sage flower can be [quite pretty](https://www.flickr.com/search/?text=sage%20flower) -- maybe you can draw some inspiration from it for this mandala. :)
Grand coloriage mandala à imprimer dans 11 coloriages de mandalas pour adultes à imprimer pour se détendre
Prisms don't "create" rainbows. Rather, they break the light coming in into separate waves of color, so it's taking what already exists and breaking it down into a simpler pattern. Rainbows in weather, are created much by the same method. The light coming into the rain is refracted into a pattern in the sky. Have you been fortunate to see a double, triple. or even quadruple rainbow?