This is how kids can engage in learning about Louis Braille and his contributions to the sight impaired.
We picked up a book from the library which happened to include the raised Braille dots for the kids to feel. Then I had them sit at our ever-so-handy IKEA kid table and asked them to close their eyes while I brought over some spices, fruits, and flowers for them to smell and feel.
The last activity was making letters with thumb tacks in a cork board. This is similar to Louis Braille’s first introduction to the alphabet before he developed the much simpler raised dot system.