Who or what is this poem referring to?
I'm always on a plane Won't fit on a boat or train Unlike most of my brethren I travel with no companions Simultaneously cold and hot I can be a dark or light spot To some I may be unrecognizable At times I'm not even visible From my routine I never deviate But sometimes I'm seen doing the opposite I've suffered battering and bruising Since I've no protective layering Subjected to a stiff breeze No one near me can breathe