That might technically be what I saw once. All the space on the inside of the rainbows was filled with more rainbows. But instead of looking like half of a enormous lollipop it looked like a huge ampitheatre that was painted in rainbow stripes. That is to say instead of looking like a flat disk like rainbows do, it looked three dimensional, like you could walk into it the way you can walk nto the stage of an ampitheatre. That was the illusion anyway.