As the editors point out, "rock art is the oldest archive of human activity," and its interpretation, although fraught with difficulty is thus of prime importance. This collection of papers, taken from the 15th UISPP congress, mainly look at specific symbols and their interpretation. Thus there are papers on faceless anthropomorphic symbols, the pentagram, spirals and lozenges, bulls horn symbols, footprint and handprint symbols, cupmarks and triangles, and net patterns and ruled rectangles. The volume is completed by two essays on particular rock art sites in Portugal and Galicia.