Situation: I am looking at chair in the corner of the room and I am standing between the table on my left and the whiteboard on my right within reach.
Alternative situations: I just erased the words on the whiteboard using my right hand only. I am standing in front of the whiteboard, walking towards the corner of the room to grab the chair and bring it to the table that is on my left side from where I am standing.
Question: What does an office chair have normally that allows it to roll easily on the floor in front of me?