(Mishnah): From when the Aron was taken, there was a rock there from the days of early Nevi'im, and it was called Sheisyah. It was three fingers high above the ground, and he put [the Machtah] on it.

(Gemara - Beraisa): Before the Aron was taken, he used to enter and leave via the light of the Aron (it illuminated). From when the Aron was taken, he would grope (feel his way in the darkness) and enter, and grope and leave.

(R. Yochanan): Why was it called Even Sheisyah? From it the world was created.

Support (R. Chiyah - Beraisa): Why was it called Even Sheisyah? From it the world was created.

It says "Mizmor l'Asaf Kel Elokim Hash-m Diber va'Yikra Aretz...; Mi'Tziyon mi'Chlal Yofi Elokim Hofi'a'' (the source of beauty of the world is from Tziyon), and it says "Lachen... Hineni Yisad b'Tziyon Aven...''