Turns out that the riddles were left in public by the creators of this fringe play, which was on a couple of weeks ago: https://thisisnotart.org/events/metaphysics-at-gunpoint-friday/

I'm going to take the best interpretations of these, print them and put them up where I found the originals with a contact email. I'll bet you the artist(s) replies.

These resemble zen poetry to me. Zen koans can seem nonsensical at first, but they are used to increase understanding of very specific concepts (thought at first they might seem bamboozling or self-indulgent). We'll see.

"who looks outside, dreams; who looks within, awakes." All the significant details are right there in between the mirrors where direct observation is possible. Within the mirrors is the reflection (image, facade) but not the reality. — BrianW

I had always thought about this one as if the infinite reflection was the greater reality, obstructed from view by one's one head, the apparatus for perception. But I like what you said, I'm going to keep thinking about it.

If you invert the sentence, you get: "When there is movement, the camouflaged becomes visible".

That's my bet for this one too. I didn't arrive at that take until I tried inverting it also.

Thanks everyone!

I was thinking along similar lines - all three seem to be about perspective. I have an idea what I think each one means but I'll wait to see what others think first.