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The idea of plant vision isn't quite as ridiculous as it may first seem.

Some cyanobacteria can "see" by using their entire single-celled bodies to focus light. A little like tiny swimming eyeballs. The idea that higher plants could contain similar structures (called "ocelli") has been hypothesised by botanists for some time. Among others, Francis Darwin (the son of Charles Darwin).

Here's an article from Scientific American with more info:
https://www.scientificamerican.com/article/veggies-with-vision-do-plants-see-the-world-around-them/

So plants may be watching you with a collection of tiny, tiny cell-sized eyes.

Watching you, but probably not judging you.

Probably.

A possibly related phenomenon is called crown shyness – certain species of trees will very politely avoid overshadowing each other in a forest canopy, leaving gaps between each others' branches.

Mostly trees of the same species will do this, but different species of tree have been observed doing this too.

Again, no one's entirely sure how the trees do this, and some botanists are probably arguing about it somewhere right now.

@InvaderXan I believe I've seen a similar 'crown shyness' behaviour in some Rain Trees at a local park here in Singapore (Pasir Ris Park). Here's a photo I took when I happened to stare and noticed the gaps between the trees.

@sohkamyung
Oh nice! Yeah, that definitely looks like the same thing! What kind of trees are those...?

@InvaderXan Those are Rain Trees (Albizia saman).

Here's a web site with info on those trees. [ http://uforest.org/Species/A/Albizia_saman.php ]