This is all about perception. This is a stone (or a rock) which is surrounded by water, dirt, and grass and it is, what it is. To all different animals, through all the different scenarios, this stone sits where its at and it becomes whatever it needs to be for its habitat. It could be daylight, the stone could be large for some animals or tiny for others, it didn't matter the time of the year or the weather condition, the stone was there. This stone, this hard, solid piece of matter was predictable, and all the the animals were using it.
The illustrations were fantastic and I loved how they showed exactly the different scenarios how the stone was used. It's a great book to get you to start thinking. What a terrific book.