<u><em>Answer:</em></u>
<u><em>Thumbnail sketches are:</em></u>
<u><em>Art directors, storyboard artists and graphic designers, as well as other kinds of visual artists, use the term "thumbnail sketch" to describe a small drawing on paper (usually part of a group) used to explore multiple ideas quickly.</em></u>
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<em>Hope this helps:3</em>
The feature that they have in common is that both are the same note for this reason they sound very alike