There are indeed many mysterious places in water transfer (without commenting on water transfer), but now many phenomena have been scientifically explained. For example, there are many illusions in our vision, some of which are oral traditional information, and so on, which will give us many unfavorable psychological hints, and this impression will affect our thoughts, and over time, it will really affect our bodies (such as photo frames and bedside mirrors).
Your colleague put a mirror, which actually affected your mood objectively.
Of course, it is best to remove ta. If not, it should be better to try to adjust your mentality.