I'm not sure I'm following you on things changing shape. Things being physical objects, thoughts, feelings, internal world, "just something" like shadows/fog in the mind - something just out of grasp or sand through fingers... ???

I've had all of the above at different times -- with physical shapes though, it's more like on the edges of my vision, if I turn and look directly at the object, it will look appropriate. In my memory later, it might be distorted in terms of size or some other characteristic.