Thomas Moran painted this Sunset Cloud, Green River, Wyoming, most likely with oils. The dramatic sky is rendered in strokes of thick, opaque paint; you can almost feel the weight of the clouds. Look closely at how he's built up the textures to mimic the raw, rugged landscape. The surface is alive, full of subtle bumps and ridges, that make you want to reach out and touch it. Then there are these small details, a little flourish of green in the lower right that suggests a bush, but it also acts as a kind of counterpoint to the monumentality of the rock formations. It's these intimate moments that really pull you in. Moran's work always makes me think of the Hudson River School, but with an added touch of drama. It reminds us that art is as much about feeling as it is about seeing. It's a constant exchange, a dialogue across time.