For example, at Social Triggers, I use this headline:
Don Ihde called the hypothesis being 'hyped' and referred to clear evidence about the use of optical tools by, ., Albrecht Dürer and Leonardo da Vinci and others. As well the 1929 Encyclopædia Britannica  contains an extensive article on the camera obscura and cites Leon Battista Alberti as the first documented user of the device as early as 1437.  Ihde states abundant evidence for widespread use of various technical devices at least in the Renaissance and . in Early Netherlandish painting .  Jan van Eyck 's 1434 painting Arnolfini Portrait shows a convex mirror in the centre of the painting. Van Eyck also left his signature above this mirror,  showing the importance of the tool. The painting includes a crown glass window in the upper left side, a rather expensive luxury at the time. Van Eyck was rather fascinated by glass and its qualities, which was as well of high symbolic importance for his contemporaries.  Early optical instruments were comparatively expensive in the Medieval age and the Renaissance. 
A thesis statement serves as your paper’s (or speech’s) guiding idea, alerting readers to the main points of your paper and the direction it will take. A thesis restatement, which comes in the paper’s conclusion, is the thesis’s kindred spirit, though not its identical twin. It differs from the thesis in both word choice and sentence structure. Restating your thesis at the end of the paper allows you to remind your readers of what you have proven in your body paragraphs and helps to bring your paper to successful close.