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This document traces the origins of Boccioni's lost sculptures, and contains a lot of findings that is new to Boccioni research. It goes into deeper details of the reconstruction process, for example how the real-life sizes of the sculptures were estimated. It is downloadable as a high- or low resolution pdf.
Umberto Boccioni - Recreating the Lost Sculptures (high resolution, 18MB)
Umberto Boccioni - Recreating the Lost Sculptures (low resolution, 4,6MB)