Obtained from Wikipedia
I find the color interactions on a Bismuth crystal to be fascinating because of all of the different hues that appear on the surface of the crystal. The reason that Bismuth shines in so many different colors is because of the different levels of oxide that reside on its surface. This causes for light to reflect in different wavelengths off of the crystal and appear as different hues.
Obtained from Pinterest
This image caught my eye because of the contrasting colors on this tropical bird. The reason for this was because of the different color contrast that appears on its feathers. I like how while all of these colors seem very vibrant, the change in value differentiates them from each other. This allows for the birds overall appearance to really stand out without clashing against itself.