What architectural concept affects how accessible spaces are and where people can move freely?

Permeability refers to the extent to which space allows movement or access between different areas. It emphasizes the connections that exist within a built environment, impacting how freely individuals can traverse a space. High permeability is characterized by multiple pathways and entry points that facilitate ease of movement, encouraging interaction among different areas. This concept is crucial in urban design and architectural planning because it directly influences how users navigate through an environment, affecting their overall experience and the functionality of public or private spaces.

While legibility pertains to how easily people can understand and navigate a space, and variety relates to the diversity of structures and forms that can promote visual interest, these concepts do not primarily focus on the accessibility and movement within a space. Robustness, on the other hand, deals with the durability and resilience of materials or structures but does not directly address movement and accessibility. Therefore, permeability is the most relevant concept in understanding how spaces are experienced and traversed.