Mike's "Color Wheel"

We took a trip to Concordia, Kansas this weekend to meet Sandra's son with some gear he needed.
I have a thing for water towers.  I snapped this then later realized that it was about as close as I was going to get to a "color wheel".

The picture I originally took was of this Rexal Drug.  I was going to explain how the blue and orange colors on the sign are done in complementary colors which are colors that are opposite each other on an artist color wheel.  Don't get me started on color wheels.  They vary from art, to print, to photography.  Retro marketers loved to use the high contrast of  complementary colors in their logo work.