Show HN: What if the speed of light was 5 km/h?

This interactive visualization demonstrates relativistic physics by simulating a world where the speed of light is only 5 km/h instead of 300,000 km/s. As users accelerate through the virtual park, they can observe relativistic effects like length contraction, time dilation, and Doppler shifting become increasingly apparent. The simulation makes complex physics concepts tangible by allowing users to experience how these effects would manifest at perceivable speeds.