Indeed, without difference, there is no beauty, and for Hopkins, to praise beauty is to praise God. In the third line, Hopkins moves from the huge image of the sky to the tiny, shiny details of a trout's scales, but Hopkins does not use the word scales. For him, they are “mole-roses”, a much richer image which gives us their color and the second use of a compound word in the poem, after “couple-color”. Such compound words are crucial to the poem and are themselves acts of creation, as if careful observation of God's creation inspires the poet himself to create. These compound words also embody the main principle Hopkins explores throughout the poem: the combination of two distinct things, in this case words, can form something beautiful when combined. The word dotted also suggests an artistic effect alluding to God as the artist and the world his work. In the fourth line we see more compound words with "fresh chestnut falls", which allude to the beauty of a just opened chestnut with its intense shine reminiscent of the glow of combustion.