A content presentation system comprising content playing apparatus and content providing apparatus operative to receive an array of digitally represented numbers, representing content as P points in D-dimensional space, to generate therefrom a plurality of projections on at least one sub-space of a vector space comprising a span of at least one D-dimensional vector, and to provide the plurality of projections to the content playing apparatus, the content playing apparatus being operative to reconstruct the array of digitally represented numbers from the plurality of projections and to expose human users to content accordingly.