I agree, Ed. But I don't understand why the 'up and down' method is so...unknown. Maybe it is a matter of something simply being so predominant...for no apparent or necessarily negative reason...that there has never been a need for any other method to become popular. Who knows?(posted 8851 days ago)Maybe this is a philosophical approach to something which really doesn't need to be philosophised over, unlike the perspective of bats and the existence of perfect islands...