Matching colors

One of the projects I’m currently working on involves images from space craft of other worlds sort of bouncing off the work of Timothy O’Sullivan. And just now I noticed that the colors of the covers of the books I posted below on O’Sullivan (presumably an attempt to accurately mimic the tone of the real photographs) is the same color as the Martian sky as depicted in the NASA Curiosity animation (which presumably attempts to acutely mimic the color of the real Martian sky).

Coincidence? Synchronicity? You decide.