The source of all imagination is here in our fields, and Creation is beautiful enough for the furthest flights of the poets. What is called realism only falls far from these flights because it is too meticulously concerned with the detail of material; mere inventories of rocks are not poetry; but all the memories of crags and hills and meadows and woods and sky that lie in a sensitive spirit are materials for poetry, only waiting to be taken out, and to be laid before the eyes of such as care to perceive them.