1.) The sunlight reveals what is beneath the surface - what would usually be hidden. There is both beauty (suprising color and form) and yuck (the refuse of rotting vegetation). Isn't this like our own interiors? Beneath our "surface" is a complex collection of experiences, thoughts and emotions...many things unseen by others, yet part of who we are.
2.) The reflection shows us what is above. No matter what lies beneath our surface, we are born to reflect something much greater and more beautiful than we could hope to be. In a still moment even pond water, and all that is within it, becomes an image of heaven above.