Why Are Cutie Marks in Threes? (MLP Analysis) - Sawtooth Waves

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Original Description below:
Why three of all numbers?

[nightwing]

I think the simple explanation is just the rule of three, where things in threes are more visually appealing to people.

[charasviaadri]

in the future fluttershy did have three FAMILY MEMBERS which is fluttershys mother, father and brother in the future 😄

[chriswaites]

Maybe flutershy just loves nature and animals and the butterfly's are shy and pretty like her or maybe it's to represent carnivours omnivores and herbivourse or maybe both and the ideal animal was simply a butterfly

[sumbeacon]

What about fluttershys parents and her brother

[Ideepuu]

Fluttershy brother name is flutter butter