What is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message?
Steganography The concept is that messages appear to be something else: images, articles, private letters or shopping lists, or in invisible ink between the visible lines.
What name is given to art that depicts scenery such as mountains, valleys, trees, rivers, and forests, where sky is almost always included, and weather is usually an element of the composition?
