Think of a stoplight. From top to bottom we have red, yellow, and then green. Imagine if the location of these colors were changed. Location of colors, from a big-picture perspective, may not matter as much.

In this case having the order of the stoplight colors can help prevent accidents (when a spotlight changes from green to yellow, it tells the drivers to slow down). Because we have the spotlight colors in the order we have them today, we respond well, but if the order was changed (imagine green being at the top of the three colors) we'd probably be a bit confused.