In this dissertation, Jesse Josua Benjamin combines philosophical analyses, technical readings and design research to propose post-phenomenological AI studies as a program for investigating how contemporary artificial intelligence (AI) technologies shape the relations between human beings and their worlds. Alongside a number of conceptual innovations refined through historical and contemporary case studies as well as philosophy-in-practice, the titular machine horizons are the key objective for this programmatic proposal: establishing a relation between the appearance of technologies and their structural make-up, and thereby unfolding the synching of human experience to the interplay of data and models of AI technologies.