The term 'permeability' has morphed from is primarily technical origins into the lexicon of architecture as architects (and other professionals) sought better language to describe the relationships of spaces to their environments and other spaces and to the interactions of users with spaces. In higher education, permeability incorporates aspects of campus spaces surrounding buildings as well as the building envelope and interior spaces themselves. In these spaces, permeability may be manifested by physical characteristics as well as how the spaces are used. Documenting uses of permeability in higher education contexts reveals design elements and potential user interactions that, combined with research findings, show that academic libraries incorporating permeable spaces and features may positively influence student engagement and learning. These factors can then lead to measurable change in student success metrics which are vitally important to campus administrators and which may raise the visibility and value of libraries to their campuses.