What's a spirit?

[unity100]

i generally see it like this :

imagine a still pool of water. now, imagine that the pool is not still, but, it is wavy. now, you see potential - there are waves that has potential to do things.

now imagine that these waves concentrate or refract at a point to make a noticeable refraction. there is a focus. that concept is probably finity concept. all the other concepts, ranging from body to spirit, are created from these.

of course, its two dimensional in this example. but you get the idea.