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In the tube, if you stare out of the window it is just black anyway so there is nothing to even look at, plus the seats (if you are lucky to get one) face away from the windows anyway.

I would find it difficult to read a book in a distracting environment like public transport

Try it - I find that I get most engrossed in a book on the Tube. Main problem is the risk of missing your stop

Tube time is great podcast time.

Solitary thinking and reflecting, I guess.

I can do plenty of that while working ;-)