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Leave it stock, then they are hardly noticeable. Painting the calipers will draw attention to them and as noted above, look Civicy. This is not a performance vehicle. Even if painted black, they will still barely be noticed behind the wheels. I did this years ago on a vehicle and the black calipers are really almost as invisible as the dirty stock calipers and when dirty looked about the same.
1. OP & others when you start a thread, you have an option of starting it as real "poll" where you list all the options [other can be an option too]. That thread then gives you the stats as members respond.
2. As pointed out, there is very little area that is visible [there is the dark side of the moon]. The visible side has the spokes that hide a portion too. But when the wheel is spinning the full face becomes visible [there is a scientific term but that escapes me now ... you can see through the privacy fence .. with minor gaps ..when you drive bye].
The term seems to be - stroboscopic effect - visual phenomenon caused by aliasing that occurs when continuous
rotational motion is represented by a series of short or instantaneous samples. See Wikipedia for the full description.