Lucidity is optional. So are clothes, sanity, a job, the ability to play an instrument well or at all, education, grammar, spelling, sense, and almost everything else.

What is mandatory is that you understand that there are only 10 kinds of people in the world: those that understand binary and those that don't. Or maybe it's not mandatory. But whatever is not forbidden is required, and whatever is not required is forbidden, except that whatever is forbidden is not required, except in months with a "w" in them and/or during a full moon after the 12th of any month if the ambient temperature at standard pressure is greater than 0 degrees Kelvin.

Clear? Now, welcome.