This influenced typographical letterforms to become increasingly detached from the written ones. Developments in printing technology, ink, and paper making, made it possible to print letterforms of high contrast and delicate hairlines.
Each type of visual aid has pros and cons that must be evaluated to ensure it will be beneficial to the overall presentation. Before incorporating visual aids into speeches, the speaker should understand that if used incorrectly, the visual will not be an aid, but a distraction. Planning ahead is important when using visual aids.
It is necessary to choose a visual aid that is appropriate for the material and audience. The purpose of the visual aid is to enhance the presentation.

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