If star war has spiders that are big enough to have spider leg meals like we have crab leg meals, that means we could put farm spiders in star wars! Spider silk shawls! That shit is strong! Maybe mandalorian and naboo battle silks aren't made from worms, but rather spiders!
So here is the wikipedia article for Vaulted Sidewalks. It is very short, and basically boils down to "vaulted sidewalks are sidewalks that have a hollow area underneath."
Which is, yes, the definition. But they're very cool!
Basically, there's two things that tend to be under a hollow sidewalk, and those are vaults and tunnels. Vaults are little rooms that extend under the sidewalk that are simply connected to the building, whereas tunnels, obviously, go somewhere else. Both were very popular before cars became a big thing!
Most hollow sidewalks only go for a few streets or so if they're tunnels, but sometimes you can get a whole underground city! For example, after the Great Seattle Fire in Seattle, WA, USA, the city leaders decided to just raise the whole city about a story, but a lot of people continued to use the original streets and entrances in addition to the new entrances on the higher level. They only stopped using the underground cityscape because twenty years later, the city condemned the lower levels due to concerns about bubonic plague. I've heard that some of it is now available for guided tours.
A lot of hollow sidewalks were built before electricity, which means that they also have really cool Vault Lights. Some of them were just grates with glass in them to let in the light, but a lot of them had prisms to throw light into a wider array and fill the tunnel with light despite the small porthole. If you click through to the link, it's got a fascinating gallery at the bottom.
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Here's a vault light from Philadelphia! The bubbles in and around the star are small glass prisms that cast light in the hollow below.
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This is what a vault light looks like from below--this one only has five of the prisms still uncovered and functional, but that's still a lot of light!
Unfortunately, most of the hollow sidewalks in the US get dug up and filled with sand, because the weight of modern cars is simply too much for the hollow sidewalks to handle, and we prefer to bow to the whims of the automobile industry as they make bigger and heavier cars and trucks, so the cool underground sidewalks and cities have to go.
But!
That's not true in star wars. The GFFA has flying cars and hover technology for all of their heavy transportation needs, so I like to think that they have extremely walkable cities and many places have hollow sidewalks. The possibilities are infinite!
Mandalore? Hollow, reinforced sidewalks. The tunnels of Sundari double as bomb shelters due to the planet's violent past.
Hoth/Tatooine/Jakku/Ordo Plutonia? Underground tunnels are actually more popular than aboveground, due to the elements.
Corellia? Hollow sidewalks have a whole different city underneath. Corellia is barely respectable on the surface, but underground they drop even the veneer.
Coruscant? Trick question! The whole planet is about seventy thousand layers of hollow sidewalks. There's vault lights on Coruscant that haven't had daylight to give to the level below them in a thousand years, but prisms are still very popular in artificial lighting because electricity is expensive and you have to scatter that shit as far as it will go.
Considering that there are also a whole bunch of alien species who prefer to be underground, I think that pretty much any medium-sized town or larger would have a robust underground element. And when the weather sucks, wouldn't it be nice to have the option to go wherever you were going, but in a tunnel so you don't have to get wet/be hot/get blown away by the wind/etc? My university had underground tunnels that connected all the buildings, but students weren't allowed to use them, and every time I was walking the long mile between my first class and my second class in -10F (-23C) weather, the tunnels were literally all I could think about I was so mad lmao.
If you want to know more about hollow sidewalks/vault lights, I highly recommend clicking on all the links in the post, and also checking out the book The Tunnels Under Our Feet by Tracy Beach [B&N link]. The book is primarily about hollow sidewalks in Colorado, but it does also have a few chapters where it talks about hollow sidewalks all over the US, like the ones in Seattle.
Dooku had three (3) psychics in his circle y’all he had
-Tyvokka, the master of Qui-Gon’s very good friend Plo
-Sifo-Dyas, Dooku’s own friend, and
-Eno Cordova, friend of Dooku’s good friend Jocasta Nu
and at least two of the three had serious visions of the destruction of the Jedi Order that the Council dismissed.
I do have to wonder sometimes, did Dooku end up with these people in his circle because he had an interest in Jedi prophecy, or did he gain such an interest because his friends were suffering these terrible visions and he decided to try and help them when no one else seemed to care? And then like, shit spiraled severely from there.