Linocut - Linograbado - Linogravure - Linolschnitt
Linocut art is made by carving an image into a block of linoleum, inking the block, and then pressing it onto paper.
The linoleum itself, specifically made for art purposes, is made of linseed oil (hence 'linoleum'), natural rosin, wood flour, limestone, and jute (for the backing).
The artist carves away what they don't want to print, thereby creating a negative space that the still extant lino will literally stand out from. The image must be carved backwards as the printed version will be a mirror-image to the carved block.
It'll twist yer head up!