A campaign against extremists has reduced violence in recent months.By shifting to the centre, though, Nahda has alienated parts of its Islamist constituency that now have few legitimate channels for expression: some are among the estimated 3,000 Tunisians who have joined jihadists in Iraq and Syria.
"We try to have as many channels for expression as we can, recognizing that different people, and different ideas, will percolate up in different ways," Bock said.
Rules can often serve as channels for expression and revelation.
The talk of Paris, for months, has been the reinvention of politics, away from traditional political parties seen as election machines but not a channel for citizens' expression.
Dr Carolyn McGettigan, lead author, says: "The voice is a powerful channel for the expression of our identity – it conveys information such as gender, age and place of birth, but crucially, it also expresses who we want to be.
Art as the channel for the expression of human emotions, energies, and experiences.
Music opens a channel of expression for those otherwise incapable of sharing their experience and expressing their pain.
"We wanted to create a channel of expression for all the victims of the brutal evictions.
UNICEF Representative in Thailand Inese Zalitis said that drama and other artistic activities "help restore self-esteem and provide channels of expression for the children, allowing them to enjoy the same rights as other children".
Yet in today's Middle East, nothing is so striking as the dearth of channels for its expression.
