This is one of those ideas that someone else has probably thought up, designed, and implemented. Oh well.
It occurred to me today that because the real number line is infinitely divisible, every possible string of digits can be represented by pointing at a single spot on some segment of this number line. The only limitation on the number of digits we can represent is the precision of our “pointing” device. If I have a sharp pencil, I can make a more precise mark at 0.325, but with a dull pencil it might be hard to determine whether my mark was supposed to mean 0.330 or 0.325.
And if we can represent digits, then with predetermined codes and protocols we can represent any type of digital information. In binary, 0.325 is 0.011. That could be interpreted as an opcode, an ASCII character, anything you want. With a really sharp pencil, you could point at 0.2957198301284949204, translate it to binary…
…and voila, you have a BIN file or maybe a small computer program. More likely, you could encode a file that you already wrote onto a single, precise mark.
By hand, I wonder how much information you could write on a single piece of paper using a well-designed code.