The materials and procedures of the 19th-century lithographer are duplicated in almost every respect by the contemporary hand printer. An image is drawn with tusche (a carbon pigment in liquid form) and litho crayon before the printing surface is fixed, moistened, and inked in preparation for printing. The printing itself is done on a press that exerts a sliding or scraping pressure.
The dream about keys is a dream that refers to solutions to one's life problems. The question you have to ask yourself when you have this type of dream is 'what is the problem I have today that needs a solution, or a key? (read all at source)
To see or dream that you are in a labyrinth indicates your desires to get to the center of some issue or problem. Alternatively, it suggests that you are feeling trapped in some situation. You feel lost and that there is no way out. Maze. To dream that you are in a maze denotes that you need to deal with a waking task on a more direct level. You are making the situation harder than it really is.