Why do some icons have a white "shadow" as a second path?

Asked by Augustine Souza

Hi, please look at my question here: http://graphicdesign.stackexchange.com/questions/18480/why-do-icons-of-the-elementary-icon-theme-have-an-extra-path

What is the purpose of the extra path? Is it an artifact or does it have some purpose?

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elementary Icons Edit question
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Solved by:
Harvey Cabaguio
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Best Harvey Cabaguio (harveycabaguio) said :
#1

A long time ago the panel where these icons were usually found had a light grey background. The white, along with the darker to lighter grey (from top to bottom) of the icon gave the icons an etched look.

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Augustine Souza (aesouza2008) said :
#2

Thanks Harvey Cabaguio, that solved my question.