^ Seems rather contrived to me. Some of the patterns don't really have any link to the character they're supposed to represent, and would be very hard to remember.
You might as well be spotting faces in clouds or representations of classical mythology in the stars. A similar illusion is achieved by those books that try to explain Chinese script as if it were purely pictographic.
If I recall correctly, the morse letters were chosen to minimise time and effort, as the most common characters are the simplest - and the numbers follow an obvious pattern.