From the OED:
frottage
[a. F. frottage rubbing, friction, f. frotter to rub (see FROT v.).]
…
2. Art. The technique or process of taking a rubbing from an uneven surface, e.g. grained wood or sacking, as a point of departure for a work of art.
From the OED:
frottage
[a. F. frottage rubbing, friction, f. frotter to rub (see FROT v.).]
…
2. Art. The technique or process of taking a rubbing from an uneven surface, e.g. grained wood or sacking, as a point of departure for a work of art.