I'm not electrical minded but I am wondering why my guitar pickup like most have the these rod shaped magnets. Why are they that shape and why is it important? I would like to make my own pickup to understand better how it functions and to see if I can achieve the attempt in making one. But i'm wondering what other shaped magnets I could use instead. I know the magnet(s) would have to lay beneath all the strings of the guitar. I would like someone to enlighten me some knowledge on this and also answer this question too: If they exist as Im not sure if they do, but if I used triangular prism rod shaped magnets instead of the standard cylindrical type, would it change anything drastic? would the pickup work? I'm asking because I want my pickup to look different, instead of these round things behind my strings I wanna have triangles instead. I just don't know if it's even possible to do this and whether theres some physical law that states magnets have to be a particular shape to work properlly etc.. I am a mechanical engineer which possibly explains my lack of intellect due to the overuse of using hammers however please, if you understand what I'm on about and would like to help me out then please do not hesitate to reply. Thanks.