1. A method implemented on a computing device for computing at least one of spatial and temporal relationships between at least first and second sequences of visual representations, wherein at least a spatial relationship between said sequences is unknown, the method comprising: for said first and second sequences of visual representations, computing on a computing device first and second sequences of ordered intra-sequence representation-to-representation transformations, respectively; and employing at least a subset of said first and second sequences of transformations to compute on a computing device at least one of said spatial and temporal relationships for joint processing of said first and second sequences of visual representations, wherein said temporal relationship is computed from said at least a subset of sequences of transformations and wherein said spatial relationship is computed from said temporal relationship and said at least a subset of sequences of transformations.