Clearly one cannot see Spirit, nor touch it. In fact, none of our senses can make it known or heighten our awareness of its presence. If that is so, why do we have images of saints, enlightened beings, or other images on our altars, walls, and shelves?
Well, we live in a material world and we thus have a generally materially-oriented mind. We can try to conceive of Spirit as something like "The Cosmic Ground of Being," but I have to say, for me at least, that is not especially inspiring or heart-opening.