The green "1" marks the door where visitors enter. However, when MacMan entered, he was told by the nice lady behind the very large desk that there are no tours. He already knew this, but at least he got to look through the doors that required company photo ID's to enter. He could see a huge poster of the Mac Cube suspended in the air just inside. When he lifted his camera, the nice lady said very nicely, "Sorry, no pictures!"
Note the Apple flag between the U.S. and California flags.