Answer:
They are two different takes on art, thats the primary difference.
Explanation:
However, time art may mean more in an era than space art does. Time art relies on sound, while space art does not. Time art relies on no space (besides storage on a device), but space art does. They both have their own mediums, but think of it as marker and paint, two different mediums, yet both can be used to convey the same things.
