I didn’t know what it meant either but it seem to tie in with a lot of reading I have been doing about Landscape and Identity
Ontology is the philosophical study of existence. Object-oriented ontology (“OOO” for short) puts things at the center of this study. Its proponents contend that nothing has special status, but that everything exists equally—plumbers, cotton, bonobos, DVD players, and sandstone, for example. In contemporary thought, things are usually taken either as the aggregation of ever smaller bits (scientific naturalism) or as constructions of human behavior and society (social relativism). OOO steers a path between the two, drawing attention to things at all scales (from atoms to alpacas, bits to blinis), and pondering their nature and relations with one another as much with ourselves.