1m high wave at eye level can cover 100m building.
Whoa! This is a double-edge sword....
Then, if you stand 1m
above the wave, you can see the complete building.
The same exact picture can be drawn upside down, and you are demonstrating that with a little elevation you can see far away round horizons. And the more you elevate, the more far away you can look.
Honestly, I cannot understand discussions about horizon, perspective, and useless demonstrations. When I can see the statue of Liberty from the Tour Eiffel, I will be convinced that the Earth is flat.