Magritte is a comedian and a philosopher in one. We see a fireplace where for the chimney a train is mounted producing smoke inside the room. On the mantelpiece we see a clock as usual, reflected in a mirror behind it. This magical realism poses the challenge for human reflection Magritte is fond of. He often pictures mirrors with e.g. a man seeing the back of his own head or a cloudy sky for his outline. The humor this time is the confusing of trainsmoke and -form with fireplace smoke and-form. The philosophy is in the linking of the train with the clock. The train not only pierces trough the fireplace polluting the realm of clocktime. The train is making that reality of chronic pollution throughout our culture as a whole! It was railroadtime that was officially installed as the formal order of time in 1884 in America when one agreed upon the setting of timezones that would facilitate the timemanagement for going places with the new speed. That this falsification of human priorities polluted the complete of our timeculture is what Magritte shows here. The smoke is the commercial preference for manipulated time against the natural and divine order of local timing. It was also an offense against democracy and hence also a pollution of the authority of the natural order of the individual person: only a minority has at any time real interest in traveling by train and its time. Magritte could also have portrayed a telephone here floating like a God in the smoke as also the ease of telegraphic (and other tele-)communication set the tone for zonetime in the late 19th century. Altogether we see the entropy of cultural time take place in one fireplace.