sentences:  Templates found on scrolls such as the 97-foot- (29.5 metres) long Topkapi Scroll may have been consulted.Found in the Topkapi Palace in Istanbul, the administrative center of the Ottoman Empire and believed to date from the late 15th century, the scroll shows a succession of two- and three- dimensional geometric patterns.There is no text, but there is a grid pattern and color-coding used to highlight symmetries and distinguish three-dimensional projections.