Invented by French teenager Louis Braille in 1824, braille has enabled millions of visually impaired kids worldwide to learn to read and write. However, the system of raised dots, representing individual alphabet and numbers, can be complicated for younger students to grasp. As a result, parents and educators are increasingly shunning the tactile literacy system, which is taught using special textbooks, in favor of online learning programs. Now, Denmark's LEGO Group hopes to reverse the trend with the help of braille bricks that allow children to learn through play.