Three mice "borrow" a postcard which is a reproduction of a painting, and from it they learn about color, pattern, line, and shape.

Three fashion-conscious mice (I guess this from their dapper wardrobes) pilfer a postcard from their human homeowners. Its a portrait of a lady in fancy Elizabethan finery, but the mice don't know this. As they have all sorts of fun looking at the pretty lady's clothes and jewelry, they also carefully but simply examine pattern, line, color and shapes