how and why?

How can a lump of metal plastic and rubber create friendships that don't die? What is it about that lump under your arse that gives this bond? Is it the sharing of danger the frills the spills? Is it the getting cold soaking wet burnt in the summers sun? Is it the social side of gangs and clubs even when you ride alone? Are there any strangers whilst you are on a bike? You dont nod or wave to people in the street, yet on the bike some days you're a nodding dog, greeting others as they ride by.  You stop to see if the bike on the roadside is ok, but cars you just go by. It aint the music or the looks I know, the laughs and tears come after the friendship grows,  is it because on the road you are alone and when you meet other like minded souls the joy is carefree to share the tales the times, i dont know the answers but i do know that biking friendships dont die if if the biker does or they become a car driver, a walker etc, brothers is a word used other in biker circles, and it is sort of true, close friends become like brothers even if it is years since you have spoken,  they know and you know there is no need to speak all the time as the next time you do it will be like it was yesterday since you last did. Did bikers start off like this or did the bikes make them this way? Stay safe until we met somewhere again or for the first time.