The map availability theory is an interesting one and worth considering This whole thing dates to the early days of the ramblers and the recreational interest in the landscape as opposed to those too busy trying to live in it On finding leylines it took me a while to hunt it down but this is a passage I remembered from John Crowleys excellent novel gypt  Star temples and leylines UFOs and landscape giants couldnt they see what was really permanently astonishing was the human ability to keep finding these things Let anyone looking for them be given a map of Pennsylvania or New Jersey or the Faraways and he will find leylines let human beings look up long enough on starry nights and they will see faces staring down at them Thats the interesting thing thats the subject not why there are leylines but why people find them   Actually I think the point of the statistical argument was that proponents quote extremely low probabilities that the alignments that they find could have arisen by chance but out of the set of all possible alignments selected from semirandom points there will be a number perhaps a majority of low probability ones Million to one chances turn up nine times out of ten     Jul  UTC