Meditation is not contemplation because it is not thinking at all - consistent, inconsistent, crazy, sane. It is not thinking at all; it is witnessing. It is just sitting silently deep within yourself, looking at whatsoever is happening inside and outside both. Outside there is traffic noise, inside there is also traffic noise - the traffic in the head. So many thoughts - trucks and buses of thoughts and trains and airplanes of thoughts, rushing in every direction. But you are simply sitting aloof, unconcerned, watching everything with no evaluation.