Enchant Enchantment

Local enchantments always want to be stuck on something else. Enchant creature, enchant player, even enchant world! Perhaps most accommodating of all is the enchant permanent, which can be stapled to anything at all, even... well, even another local enchantment, come to think of it. Is there something that can be done with this fact?

Consider this: play Indestructibility on one of your cards. Now play a second Indestructibility, enchanting the first one. Lastly, use Simic Guildmage to make the first Indestructibility instead enchant the second one (which is enchanting it in turn.) The result is two auras that are only kept in play by virtue of enchanting the other. Oh yeah, and in this case, they happen to be indestructible, too? Weird stuff.
"Something here is indestructible."
"What is?"
"The indestructibility."