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Narrative
The chair conformation of cyclohexane can be twisted into the boat conformation. Further twisting results in a second chair conformation. By labeling one axial substituent with a white sphere you can see how the axial position of one chair becomes equatorial by twisting into the second chair conformation.

Discussion
Ball-and-stick and space-filling models of cyclohexane are shown in the chair conformation. The fourth picture shows the axial substituents labeled with green and the equatorial labeled with white spheres.