1. A sheeting comprising: a layer of a shape-memory polymer material having a surface of microlenses, wherein the shape-memory polymer comprises a polysiloxane with a poly(meth)acrylate switching segment, wherein the polysiloxane comprises a telechelic siloxane, wherein each of the microlenses is associated with one of a plurality of images within the sheeting, and wherein the layer of the shape-memory polymer material is responsive to an external stimulus by transitioning from a first state in which an optical property of the microlenses has a first value to a second state in which the optical property of the microlenses has a second value.