A visualization service generates a graphical representation or visualization of each user's behavior within a network resource, such as a website. In one example, the visualization service provides a dynamic visualization of each user accessing the network resource. Each user is graphically represented in the visualization with an indicium, such as a point or dot. The visualization (and thus, the position of each indicium representing a user) is dynamically updated as each user accesses data files from the network resource and thus, moves from state to state (or page to page) over time. The effect is similar to watching cars move along a complex highway system.