What's the Best Optimization of the Cup?

When we're trying to perceive an object, especially if i don't know what the object is initially, i don't remain static. I'm going to move around the object until i get to a place that gets into a trade off relationship. What do they mean by that? So dryfus and others talk about "an optimal grip" That's such a wonderfully felicitous term, because it hearkens back to conformity theory of cognition.