Sometimes, the Tube is crowded…

I noticed that the people standing up in the aisle separating the rows of seats, often face the same way. On this rush-hour journey, I saw backsides and rucksacks when the standees closest to me were all facing away.
Medium: Digital drawing created on an iPhone 6 and using Adobe Draw app
Drawn: 13th February – 9th March 2018
Timelapse of the drawing: