 There’s an inherent difference between horizontal and vertical directions; with only one vertical direction but many different horizontal ones. There’s an inherent difference between higher and lower places, hence also an inherent difference between upward and downward motion. Some objects are undifferentiated point particles; others are extended, with distinguishable fronts and backs and sides; a few have distinguishable tops and bottoms as well. (An object’s front is the part of it that normally faces forward as it moves and the part one normally needs to manipulate if one has serious business to transact with the object; a thing’s top is the part that is normally highest up, etc.) Some motions, the forced ones, result from external influences on a moving object or substance, pushes or pulls exerted on it by other objects or substances in its immediate physical surroundings. Others, the spontaneous motions, occur at the initiative of the moving thing itself; these are physical actions on the part of physical agents. Some objects are hollow and can accommodate other objects or substances within themselves, in an interior place that moves around with them whenever they move around; these are the containers. One place or object may be connected to another place or object by a traversible path consisting of intervening locations. Such a path may be short, straight, and direct; or it may be long, crooked, and indirect. Objects and substances stand in relations of fitting, sticking, gripping, supporting and the like, and each of these relations has immediate consequences for how (and how independently) the objects or substances in question can move. Etc.