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This low poly tutorial made using illustrator shows how the artist rapidly uses eyedropper and pen tool to draw and fill triangles.
You can see that he ain't adjusting the triangles and still can make perfectly adjacent triangles, what do you think is he doing?, including keyboard shortcuts.
He's merely drawing triangles with the Pen Tool. Smart Guides are active to allow the paths to "snap" to each other and there is an occasional adjustment to the triangles as seen when the Bounding Box appears for a brief moment.
