Christopher must have a daily routine:

[…] so I went out of the ticket office, but it wasn't like a computer game at all because I was in the middle of it and it was like all the signs were shouting in my head and someone bumped into me as they walked past and I made a noise like a dog barking to scare them off.
And I pictured in my head a big red line across the floor which started at my feet and went through the tunnel and I started walking along the red line, saying, "Left, right, left, right, left, right," because sometimes when I am frightened or angry it helps if I do something that has a rhythm to it, like music or drumming, which is something Siobhan taught me to do.
(page 154)

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