Once A Wall, or Ripple Remains is the last fold in an on-going documentary project spanning more than seven years to date as well as a wide range of media (from single channel video, CD-ROM, website, to written text, 3-D animation, and interactive installation). The various media reflect and undermine each other's reports, detecting gaps, contradiction and bias in the perception and mediation of the primary experiences or encounters that set the trail of records in motion. Together they form a shifting history not only of the experiences themselves, but of each moment's viewing and of its articulation: a manifold document that questions the stability of any perception, record, or rendering of such encounters.