I discover some small tricks every now and then, and since I don't feel like writing full tutorials on them with actual good-looking pictures, most of them get forgotten or lost in the "What Did You Just Do..." thread. I've decided to finally make a place to post these when I find them - feel free to share your own here too!

These two walls act like they're as tall as a full wall for blocking paths even though they look just half a wall tall. This doesn't happen with some of the other material's walls in this shape, so it might be a bug (I'm really hoping Sebioff decides not to fix this, though.)
So if you place them 0.25 units under the ground (0.75 units or three moves down while holding shift from on ground level), they're completely hidden. They still replace fences on queues or slopes, and disconnect paths - which is probably most useful for adding path edge deco:


The one problem I've run into is that I can't get rid of entrance and exit fences still because those are impossible to replace (hopefully
this gets changed.)

Edit: Reddit user /u/thrashfan brought to my attention that this fence piece also works (though it doesn't in A16+). The tall fence just called "Fence", the tall iron fence, and tall jaeger fence still work. On a related note, "fence" doesn't look like a real word to me anymore.
I've been sitting on this one for a while. I did this once in my Disney park - though I didn't know they could be hidden this well without needing path covers back then. I used the second part of this for the benches at the tables
by my vanilla invert, though I'd forgotten these pieces so it was hidden even worse. After seeing Coasterb's excellent drop tower and then wondering if you could hide the fences on queues, I decided to try to perfect this.