An image or mark in a sheet of paper visible when viewed by transmitted light. It is created using a pattern of wire sewn into the mould on which the sheet of pulp is dried; the paper which settles above the wires is thinner, and so more translucent. The image usually represents the papermaker's trademark design or logo, sometimes with a name, initials or date. Although more common in historical papers (handmade) modern specialist printmaking papers often contain a watermark.