Here are some vintage mock moons from American Explorations in the Ice Zones by Joseph Everett Nourse (1884).

How consciousness bends the body: an illustration from The Rosicrucian Cosmo-Conception by Max Heindel, 1911.

[For Jeff Hawkins.]

An illustration from The Gate Beautiful by John Ward Stimson (1903).  The caption reads: "The Law of the Three Primaries."

An illustration from The Gate Beautiful by John Ward Stimson (1903).  The caption reads: "Atomic Ladder-of-Life: From solid—to liquid—to gaseous—to etheric—to spirit life."

"You should always remember that society isn't always all that it's cracked up to be."
—Patrick W. McDermott, The Memoirs of the Walrus (2010)

Voluntary and involuntary clairvoyance: three illustrations from The Rosicrucian Cosmo-Conception by Max Heindel  (1911).

Here's a precursor to the Death Star from Star Wars, which appears in The Quiver, 1897.

An illustration from a 1902 edition of Vaught's Practical Character Reader.  The caption reads: "The Psychological Railway."  (Thanks, Gordon!)

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook:

From Prof. Oddfellow's sketchbook: