‘X zài Y pángbiān’ (X is beside Y) (e.g., Qiú zài zhuōzi pángbiān) (The ball is beside the table.): The compound position noun ‘Y pángbiān’ refers to the sides of or to the domain/space projected horizontally outward from a side of the reference object. Laterality obtains if the located object is on or has contact with a side, or occupies a position in the space horizontally projected from a side of the reference object.
Yīyuàn pángbiān shì xīngxīng chāojí shìchǎng.
(Beside the hospital is Star Supermarket.)
Xiǎo Míng zuòzài māma pángbiān.
(Xiao Ming was sitting beside his mother.)
Shūjià de pángbiān tiē zhe yī zhāng zuòxī shíjiānbiǎo.
(On the side of the bookshelf was glued a daily schedule.)
The located object ‘Star Supermarket’ occupies the space horizontally projected from a side of the reference object ‘the hospital’ in (1a), in (1b), the located object ‘Xiǎo Míng’ occupies the space projected laterally from the reference object ‘māma’, or he may have some contact with her. Obviously, the daily ‘schedule’ is on a lateral side of and thus has coincidence relation with the reference object ‘the bookshelf’ in (1c), and the two spatial relations ‘coincidence’ and ‘laterality’ interact with each other.
 Loar, J. K. (2011). Chinese syntactic grammar: functional and conceptual principles. New York: Peter Lang.