CONCESSION: Like the strawman, the concession technique presents the opposing viewpoint, but it does not proceed to demolish the opposition. Instead, it concedes that the opposition has a valid point but that, even so, the positive argument is the stronger one. This method is particularly valuable when you know your reader holds the opposing view.
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. 
1. Determine the type, purpose, and audience of your paper.
2. Ask a question, then make the answer your thesis statement.
3. Take a stance, then ensure that it is provable.
4. State it in two parts: a clear topic and a brief summary of what you will say.
5. Limit the thesis to one or two sentences.
Every English teacher has experienced the frustration of introducing a writing skill, like how to write a thesis statement, over and over again without it ...
Medieval Christians and Muslims were fighting exclusively for deeply held religious beliefs.