Looks like the lid was just sprayed down with a strong stream of water which splashed on the fence. Look at the darkened area of the fence just in front of the lid. Whether or not the mirror effect on the lid was meant to decieve, I do not know.
I looked at tis the other day as well, I think they are trying to hide that the surface is sun damaged since it is florida, it probably has a chalky appearecnce when its dry.