Question about Spacetime

A still object moves in time but not in space. What I mean is, say a vase is sitting on a table; it is moving with you and everything else, forwards in time but it is not moving around in space.
Yet according to Einstein, space and time are not seperate things but one thing called Spacetime.
So, if Space and Time are one thing, why is it that an object can move in time without moving in space?
Why is it that the vase on the table is moving forwards in time but staying still in space as if space and time were two different things.
I understand that it is the gravity of the Earth that is holding the object still but why is it that things can stay still in space but not in time? Why can't a thing remain motionless in time?
I'm not claiming that Spacetime doesn't exist. I would just like an answer.