Clusters is a universal namespace. All the blockchains, all your wallets, one name. So if I'm foobar, my clusters name is foobar/ All my wallets are then suffixed individually under this universal name, just like a website URL. My ethereum wallet could be foobar/eth, my solana wallet is foobar/sol, my bitcoin wallet is foobar/ordinals. I can also have multiple wallets on the same chain, for example foobar/defi and foobar/nfts can both be ethereum wallets.