The Golden Ratio used in the Phi Grid, can also be used to generate the Fibonacci Spiral. This pleasing spiral is common in nature and useful in photo composition, especially for landscapes and wide shots.

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To apply this rule, place the main subject of your scene at the smallest part of the spiral and supporting elements along the spiral to lead the viewer around the image in a natural flow. 

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Tap the screen to move the spiral.

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NOTE: The Fibonacci Spiral composition rule is based on the Fibonacci ratio of 1.618, which might not be the same ratio as your photo.