Body vs. Spirit

Are our spirits and bodies interconnected or completely separate? Is there a way to know or find out? How could we decipher the difference? I view this subject as a light bulb. Without light, a light bulb becomes solely a bulb. Useless and inanimate. This co-relates directly to humans. Without spirit, we would be just as useless and inanimate as a bulb without light. But just as light takes up no space and cannot be contained, spirit is just as inconceivable. We cannot hear or touch light, nor our spirit, but what we can do is feel. We feel the warmth of a ray of sunlight against our face. It warms us and it is undeniably present. Just as is our spirit. We feel such strange and terrible things. It is said that there is no real reason for the human body to create and excess of liquid in our tear ducts when we are sad. Yet we cry. How? Our spirits feel such feelings that perhaps it is our souls crying and not our bodies. The spirits within us are therefore unique and separate. We are not our bodies, they are but shells protecting us. Simply souls and spirits within it.