Kudos to you, if you already knew why leafy trees and Camera Obscura belong together.
If not, it’s both simple and difficult at once: See, if you let light come into a dark cavity by means of, say, a pinhole, then you will have whatever is outside the dark cavity projected onto the wall of the cavity opposite the pin hole.
There’s many “pinholes” in the crown of a leafy tree, right? In this case, the image shows an upside down solar eclipse.
So, what does it take to geek out about leafy trees? Realizing that leafy trees can act as Camera Obscura during solar eclipses, that’s what!
(…well, one of things it may take, that is…)