Three Echo Stone

Three Echo Stone
Three Echo Stones refers to the three stones from north to south on the stone road outside the gate of the Imperial Vault of Heaven. If you speak facing the vault while standing on the first stone, you will hear one echo; standing on the second and then the third stone, you will hear two and three echoes respectively.

Dialogue Stone
Counting from the platform, the 18th stone is called the Dialogue Stone. Standing on the Dialogue Stone, you can have a dialogue with someone at the northeast corner of the East Annex Halls or the northwest corner of the West Annex Halls, which is about 36 meters (118 feet) away. Magically, these three points compose an equilateral triangle with side length is 36 meters (118 feet). If you leave these three points, there is no such effect.