I never saw this as anything other than forks on a purple towel. I have no idea what else it could be. I was thinking maybe it was supposed to be like that plates illusion, one of the forks would be “backwards” and once you saw the backwards one all the others would flip to match it, or something like that. But reading the comments here, clearly I was supposed to see something else entirely and then it would change to forks. But, uh, yeah, that never happened, it was just forks.