While Ramanujan didn't specifically "draw circles" to organize numbers, he did use visual diagrams to explore the relationships between numbers, particularly in his work on partitions. He famously used circular diagrams called "Ramanujan's Circle Method" to represent the ways a number can be partitioned (divided into smaller numbers). This method helped him develop powerful formulas for calculating partition functions.
It's worth noting that the visual aspect of his work was more about conceptualizing the problem than using literal circles to draw numbers. He used graphical representations to understand the underlying patterns in numbers and to develop his groundbreaking mathematical ideas.