This chair has 8 legs, but they aren’t configured like a spider, they are configured like a normal chair, but with two legs coming out of each spot where there should only be one. The advantage of this design is that this chair can walk for you.
Combined with the large quantity of electronics in the seat of the chair this thing can move itself or presumably itself plus a passenger across a room, maybe further. The tubes for the legs are made of steel with chrome plating, and other than that it’s a very basic chair.
As I said, you can buy them, so the shipping time is 6 weeks, but they’ll custom make you one in that period. Of course the convenience of a walking chair doesn’t come cheap, and it’ll cost you a whopping 15k Euros, or about $23k in USD.