Door

Sitting at one of the stops, my view out the window shows me a building. It is a newer office building made with large, pale cream bricks.

On the front are both a regular door and a revolving door. Sitting and watching, a rather odd pattern emerged: women used the regular door, and men went through the revolving one.  

One pair was talking as they approached the building. They split up, with her opening a door and him spinning into the place, then reconvening their conversation on the other side.

A woman came from the right, walked past the revolving door (out of her way) to use the regular door to enter.

In all, while waiting, 4 men and 6 women entered this building and every one followed this pattern. I don't know what to make of it.