I'll try to remember to check them out later. One of the operative conditions here is that young people, being largely ignorant, "discover" ideas which they think they are the first to stumble upon, not realizing that almost all ideas not specific to technology have been investigated by each generation for thousands of years.
When i was very young, and learning caligraphy, i "invented" an alphabet. It was similar to the "balloon alphabet." Also known as bubble letters, variations on this theme are common among graffitti "artists."
Over the last 40 years and more, i've noticed how prevalent this style of lettering is among graffitti "artists." I suspect that each generation of taggers believes that they have invented it.