Well, here there are some drawings made inside the subway, in the route to the college.
Some people dislike when realize that they are been observed. As Walt Stanchfield said: “Don’t be afraid to sketch in public places such as museums, parks, restaurants, etc.”, because that's is the best exercise to our minds and drawings. Also Leonardo da Vinci advised his students to make drawings in public places, carrying a sketch book all the time. Whether two great masters said these things, why do I have to disagree with them? Let our drawings out!