Radish
This is a radish. Well, technically it's a picture of a radish. Well, technically the picture is an assemblage of pixels that are given different color values that then shoot photons into your eyes and your brain interprets them. I think that's abstracting it down far enough. This is a radish in the ground.
radical
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The word "radical" comes from the Latin term "radicalis" which is also the root of radish.
Interesting. I did not know that.