For five years he was in solitary confinement in a cell 180 centimeters by 180 centimeters (6 feet by 6 feet) where, locked in with his own thoughts, he had plenty of time to plan what to do when released.
The other, more subtle issue, is that while videos work great for single, uninterrupted viewing (think of a solitary user viewing it at his desk via the Web on-demand), they are inflexible for interactive scenarios, such as presentations by salespeople.
"I ask everyone (who asks about solitary confinement) to give up their cellphones, their TVs, everything, for a weekend, and then lock themselves in the bathroom, " he told me.