This introspective clearly shows Emily Dickinson's facination between the inner self and the outside world. When the sky and brain are put side by side she does not necessarily say which contains the other. Therefore, the brain can contain the sky mentally while the sky contains the brain physically. The same applies to the sea. The brain is able to absorb the sea "as sponges" do, while the sea simply can take in the blue brain like a bucket takes in an object. The brain is just the weight of God and this is interesting because one usually does not speak of God's importance in terms of earthly substance. This brings one to realize that the brain with its content, knowledge, and power is yet another thing uncapable of being summarized by weight.