In a 1941 essay, the architectural historian Sir John Summerson called it "surface modulation". The earliest decoration and ornament often survives from prehistoric cultures in simple markings on pottery, where decoration in other materials (including tattoos) has been lost. Where the potter's wheel was used, the technology made some kinds of decoration very easy; weaving is another technology which also lends itself very easily to decoration or pattern, and to some extent dictates its form. Ornament has been evident in civilizations since the beginning of recorded history, ranging from Ancient Egyptian architecture to the assertive lack of ornament of 20th century Modernist architecture.