Ordinary mind would not make a world if it were not ontologically thick, if there were no differences in degree of being, say between the knower and the knower of the knower and other similar or quite different instances. That some places and situations have more felt being than others is what makes for place. When you look closely at any instance of this it is revealed as something like a trick of perspective, a trompe d'oeil. It has to be like this because it is something in experience and all experience that conveys any sort of meaning is transient and shaped by structures of meaning. But this doesn't mean that there is no ontological depth - you can only be tricked by trompe d'oeil because you really are in three-dimensional space. It's only that you can't get a hold on that depth, it isn't about meaning at all. These structures arise like foam, they are in depth without fixing it. Depth makes experience possible but can never be in experience.