One of the things that I'm most drawn to regarding public service is its systemic nature. In the United States, government is federated by design, and taken as a whole, constitutes the largest "system" that I'm aware of. Beyond just the technical systems, the system of government is composed of policies, people, and a network of agencies that coordinate (or don't), to deliver public services citizens expect and rely upon.
Estonia is a much smaller system, compared to the United States, yet has many of the same sub-systems any government is made of. This interactive visualization of Estonian government on YouTube begins to convey some of the interdependencies of government as a system.