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For some of my favorite identity work on Behance, I frequently see diagrams with well placed grid lines and circles such as Denis Olenik's gorgeous work for Savviva:
In practice, I'm struggling with how to get the shape to actually conform around these circles when using Illustrator. I thought I was decent with the pathfinder options, but when it came to actually rounding shapes, I'm struggling with having perfect accuracy for where the circle falls.