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Tips:
Adding a decimal at the end of the first number will repeat the shape, slightly shifted to one side.
Multiplying each number by 10 speeds the completion of the shape faster, but lowers the quality.
If you get a random series of scribbles change the last number to negative.
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Fill in 3 consectutive numbers from the Fibonacci-sequence (0.1.1.2.3.5.8.13.21.etc.). The higher the numbers, the closer your shape will get to the Cardigoïde. The 2nd number can either be positive or negative.
Also; Fill in 3 consecutive Prime-numbers. 1st one being positive, 2nd one positive OR negative, 3rd one positive again. You will get a beautiful symetric shape, exept for (2, -3, 5) because it also belongs to the Fibonnaci-sequence. (3, -5, 7) is partivurarely beautiful!