They also unavoidably refer to his own confinement, which China's government has forbidden him from discussing.
Meanwhile Hicks was being held in solitary confinement, which grew worse with the years.
He was convicted the next year and sentenced to seven days in confinement, which was suspended.
Jailers often relied on solitary confinement, which could drive prisoners mad, but the impulse, at least, was toward rehabilitation.
Some of you may have seen 6x9: a virtual experience of solitary confinement, which we launched on theguardian.com in April.
(Nor does it deal with the widespread use of long-term solitary confinement, which has led hundreds of state prisoners to go on hunger strikes in recent months).
Mr. Dayan vividly captures the cruelty of long-term solitary or "supermax" confinement, which has increasingly become business as usual in American prisons.
The Guardian's award-winning first virtual reality project 6x9 - a virtual experience of solitary confinement, which was released earlier this year, will also be available on Daydream.
Another man slashed his arm with a razor blade after being placed in solitary confinement, which Kanyinda told me was a constant fear among detainees.
Solitary confinement, which typically means up to 23 hours a day in isolation, can cause depression and rage after a few days, with severe mental suffering when imposed for longer periods.
"Hell Is a Very Small Place: Voices from Solitary Confinement," which he co-edited with Casella and Sarah Shourd (who was held in solitary confinement in Iran for four hundred and ten days), will be released on February 2nd.
