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Many have remarked that colors in nature seem more intense just after it rains. This is caused by the effect of refracted light on a wet surface. A similar effect can be seen on rocks in a stream where the wet surface appears darker and more intensely colored than a dry portion of the rock not touched by water. The same is true of wet sand on a beach. Realist painters pay attention to this kind of detail, but all painters are aware that a dried painting will look slightly less intense than one where the paint is still wet. Varnish or certain mediums added to paint can enhance the wet look after the paint is dry. A varnish creates smoothness just like water on a rough surface and refracts light in a similar way. The human eye can easily distinguish these subtle differences, but it is the perception of the viewer that determines if such nuances are brought to awareness. Painters teach viewers how to see much like writers teach readers how to think from alternate perspectives. Art may be considered non-essential or purely entertaining, but it is also a powerful teaching tool for those open to its lessons.