I don't know that it's even so much about the 'trying to guess game', though that's clearly an appeal for some people to some abstracts. I think for me, when I don't know what it is, I can just see the structure, color and texture. It's not 'disturbed' by all the preconceived notions I have about the subject. For me, the less I know about an abstract, the better. It becomes a pure visual image, devoid of any meaning, other than what I create, or at least that's what I've always felt is the point of an abstract.