erin tilton has been following this story for us. erin: so what is this thing and where did it go? well, to both those questions, we don't know and we don't know. i mean, this object appeared earlier in the month and of course it led a lot of people. i mean just look at it. think about 2001, a space odyssey the famous movie from stanley kubrick, where a monolith was discovered in the desert and put there by aliens. now when it comes to this thing, as you were saying, there are a lot of different theories. some people are saying it's no mas to 2001, other people are saying it's a prank. and still others are saying it's an art installation, something that a sculpture hid out in the desert to be discovered and then talked about by the world. but right now, we really don't know who or what is actual response of the creation the monolith, any plausible theories on who made it. well, it seems now if you look at most of the evidence, it was most likely not necessarily a prank, but maybe a sculpture, an art installation. some people however, saying that it could have also been a prop from