The opening up of people’s mindsets and sensibilities

1. Does "the opening up of people’s mindsets and sensibilities" mean "the representation of people’s mindsets and sensibilities" or "freeing up people’s mindsets and sensibilities from restrictions"?

2. Does "even though unintended and non-specific" in the following context mean "even though it is an unintended and non-specific shift"?

Context:

Not only did these advertisements help diffuse postmodern attitudes and outlooks to a much wider public than ever before, but, according to the mission if not exactly the spirit of the historical avant-garde, they successfully brought art and life together in a highly accessible manner. Not only were these campaigns key to the remoulding of consumer attitudes, they were also vital agents in the opening up of people’s mindsets and sensibilities, to the effect that this might be seen as a radical, if not political, shift, even though unintended and non-specific.