Echo, Reverberation, Resound
If you poop on the roots of a building, the sound will echo all the way through the building, and each and every person in there will know what you did.
Hear the poop echo. You know what a poop usually sounds like, now imagine that sound again, but louder and with an echo. How could anyone not notice?
きょう
ひび
None
The echo doesn't stop there, this building's roots extend throughout the entire city of きょうと. The echo reverberates and soon everyone in きょうと is listening, horrified, to your poop.
Welp. きょうと knows you pooped. That will echo through your memories for the rest of your life. I hope you're happy.