The Unknown Spiral

Description: Uploaded as a request Looking for parametric curve definition to produce this kind of imagery as it is now an approximation The idea is the following in technical drawings for example giving an object a particular tone is achieved by hatching Hatching may consist of parallel lines drawn with the same line weights But how could someone make an angled hatch in a polar way meaning anything but concentric circles Still keeping a consistent tone at the end Any ideas Archimedean spirals are a close match if the width of the stroke is 0 but not this case

Date: 2014-10-08

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The Unknown Spiral sourced from Openclipart is licensed under CC0 1.0

* Note: Date might not match original source and might be an educated guess.