Henry Perky invented shredded wheat. His son, Scott, was also an inventor, though not as famous. He invented and patented a bi-directional, symmetrical font
which could be read from left-to-right or right-to-left.
Perky's idea was that this would allow one to read a line of text from left to right, and then read the next line right to left, without having to move the eye back to the beginning of the line. This, he claimed, would reduce "brain fag":
The invention consists in certain means of printing alternate lines, whereby the reading can be done from left to right and from right to left in a continuous manner, and the skipping from the end of one line to the opposite end of the next is avoided.
Randy Ludacer of Beach Packaging Design
It is hardly necessary to allude to the strain upon the eyes and brain, which results from much reading. To students, researchers and others whose lives are cast among books, any device which promises to facilitate reading in such wise as to lessen fatigue of the optical tract, and consequent headache and brain fag, will appear of unusual importance.
took the time to set the first three lines of Perky's patent
in the bi-directional font, so you can experience what it would be like to read it: