I posted this comment on another thread....

I was curious about that note ~ It has Leonhard Euler on it. He was mostly known for math:

[link to www.usna.edu]

So... where do all of the modern space graphics come from for his note design??

Of course ~ you can't help but notice ~ the LEO in his first name.

Coincidence? I don't believe so. Just another puzzle piece.... Have fun with the puzzle kiddies!