Can people actually see spirits?

You cannot see the perfume of a flower, yet the perfume is there just the same. You cannot see your own dense atmosphere, yet a hurricane will uproot a forest in a short space of time. You cannot see magnetism, nor electricity, yet it is the coalescing of these two unseen forces in Nature that causes all combustion and flame. You cannot see spirits in their usual state, yet they often feel them, as well as other spirits or angels. You cannot see and hear spirits, yet that does not alter the fact that they are with you just the same.