Before you enter St. Peter's Basilica you must pass through St. Peter's Square (Piazza San Pietro). It's a magnificent elliptical space (240 metres wide) constructed during the pontificates of Alexander VII and Clement IX (1657-1667). Colonnades embrace the square and all who enter. 
The Square may be thought of as "liminal" or "in-between" space where boundaries are dissolved, where people may enter freely on the way to somewhere.
In Christian terms, we may think of liminal space as connecting heaven and earth or body and soul. It's that place where we venture out of our old ways into new, as yet, untrod future ways. St. Paul would have understood it as that space between the way of the flesh and the way of the spirit, that in-between place and time when we wrestle with our soul on the way to healing, conversion and spiritual freedom.
Occupy Vancouver is located in just such a liminal space in front of the Vancouver Art Gallery, part of the so-called Robson Square. Robson Square may not be St. Peter's Square, but they both provide that free space for people to gather – and even to protest.
From the Occupy Vancouver website I take these words:
Occupy Vancouver – A Non Violent Movement for Social, Economic and Political Change
"We, the Ninety-Nine Percent, come together with our diverse experiences to transform the unequal, unfair, and growing disparity in the distribution of power and wealth in our city and around the globe. We challenge corporate greed, corruption, and the collusion between corporate power and government. We oppose systemic inequality, militarization, environmental destruction, and the erosion of civil liberties and human rights. We seek economic security, genuine equality, and the protection of the environment for all."
The increasing global inequalities in power and wealth have been the concern of Catholic social teaching for decades, particularly during the pontificates of Blessed John Paul II and Benedict XVI.
One may argue about the efficacy and legitimacy of the "occupy movements" proliferating around the world. No social movement, or human institution for that matter, comes fault free.
Regardless of where you stand on the matter, one thing is sure. Occupy Vancouver and the Vatican are speaking the same language. The messengers may be different. The form of delivery may be different. But the heart of the message is the same.
The open space in front of the Vancouver Art Gallery and the open space in front of St. Peter's Basilica embrace the same desires of the human heart.