This is the Yellow Doomsday Mural, a Chiliad related asset.
Notice how it too, references perspective, and sight, and take into account the far right sharing glyph. What does shading have to do with the Chiliad Mystery?
Take a look at the ape drawn onto the mountain, notice how one is completely invisible? That's where shading comes into play. Certain hidden images are obscured by time of day.
We are working with keys. Weather, Time of Day, and perspective, among others.
Let's expand on this certain area. When the time is right, and you are viewing it from the right angle, (two things that are literally on the yellow doomsday mural.) Hidden images are revealed to you.
So looking down from above is just the start, to induct you into this different mode of thinking. Once you're there, the secrets are everywhere.
So back to the image, it's Bigfoot, with an egg under him (eggs are very important and point to easter eggs.) and a giant R to the left. It doesn't get much clearer than this.
So sure, these are easter eggs, but can we tie map art directly to Chiliad?