Years ago, at NAS Alameda, they ran out of black paint and started numbering the red rollaways with gray paint....I noticed something; The human eye has trouble focusing on Gray and red together- it looks like it is shimmering! I also noticed this same effect with light green tree leaves against the orange sandstone in Zion NP a few years later.
This may be a neat graphic logo idea for a shirt in the future........
Here is a pic of what I am talking about
[This message has been edited by cvxjet (edited 12-22-2019).]