Situation: I am sitting on the office chair at the table and facing the table with the cabinet behind me.
Alternative situations: I sat in the office chair at the head of the table to conduct the meeting and there were many chairs in front of me. Getting bored by the news on the TV behind me, I turned to a table, planning to organize some letters and bills and throw away the picture on my left.
Question: Is the number of trash cans on my right even or odd?