Block printing has also been extensively used for decorative purposes such as fabrics, leathers and wallpaper. This is easiest with repetitive patterns composed of one or a small number of motifs that are small to medium in size (due to the difficulty of carving and handling larger blocks).[27] For a multi-colour pattern, each colour element is carved as a separate block and individually inked and applied. Block printing was the standard method of producing wallpaper until the early 20th century, and is still used by a few traditionalist firms. It also remains in use for making cloth, mostly in small artisanal settings, for example in India.
Yes of course. We already have devices that can read facial expressions and respond to them. At some point technology will evolve to the point that it will understand hand signs as well. It can be used to support a conversation with someone who is hard of hearing, or teach people how to sign in ASL without an actual teacher.