Once, to gloss over many details, I had a signal lamp on my fire escape and started quietly yelling morse messages into the void. At first I used a reference sh

Once, to gloss over many details, I had a signal lamp on my fire escape and started quietly yelling morse messages into the void. At first I used a reference sheet looking up each character as I needed it. Then something clicked in my head and I no longer needed the reference. I accidentally learned morse code. I've seen the same thing happen in real time with other people. There's something like a phase change above some fraction of learned information which makes the rest fall into place just after some threshold.