Attention teachers and parents of kids doing school projects on Braille! Remember, a stylus is only the tool you use to punch the Braille dots in the paper - which means you still need to have a slate besides to write Braille. Without a slate, you'll end up with ugly holes and tears (instead of perfectly formed dots) in the paper. What's more, due to the precision-layout of a Braille cell, you really do need a slate to help organize the dots into letters that blind people can actually read by touch.
(From the Styluses shelf.)