In the garden: Stacking functions
Try never to do only one thing at a time, which isn't the same as doing many things at the same time, which will only confuse you. For example:
I put in the U-hoops to support the cukes in their thigmotropic process (hat tip, Dromaius) and the stakes to support the tomatoes. My principle, in all cases, is "Let vines be vines!"
But observing the garden, I see the U-hoops and the stakes perform a second function, besides support for vegetables that like to twine: Birds perch on them all the time (and not just hummingbirds, but also chickadees, and the cardinal pair. Not crows). And if you look at the photos with, er, a bird's eye, you can see there are good perches: If you were to perch on one, as nippersdad has explained, a predator, like cat, can't get close, unobserved, and then leap, ZOMG.
The raspberry patch, as I have said, is also an example of stacking functions: Fruit, protection from physical intrusion because of the prickles, protection of privacy because of thickness and height, and bait for the hated Japanese beetles.
In politics, when we see stacking functions, we say "It's a two-fer." But a stack of two isn't a very deep stack; and in fact, the U-hoops and poles have a third function: To serve as masts for the metallic deer-frightening tape. So there's a "three-fer."