Inferences
The figure shows hierarchical circles. The topmost level (the biggest circle) is the superclass shape (of UFOs). The second level is different UFO shapes such as diamond, square, or rectangular (Each circle is one kind of UFO shape). Zoom into one circle, it is the third level. In the third level, each circle represents a US State where UFOs were observed.
We see that several of these shapes are common in California and New York.