As Jinja Shinto (Shrine Shinto) was established, Shrine, Haiden (a hall of worship) and Honden (main hall) were erected, and its premises (boundary with nature) was defined, the shiniki, which was supposed to be a border between Tokoyo (the perpetual country) and Utsushiyo (the actual world) but was not as clear as it should have been, came to be clearly defined.
神社神道が確立され、社や拝殿や本殿が、建立され敷地（自然との境界）が明確になるにつれ、曖昧であった常世と現世の境界でもある神域がはっきりと区別されるようになった。