An animation showing how several distinct Lewis structures can be obtained from butane through the rotation of a single carbon-carbond bond.
These molecules were modeled through a combination of ORCA, UCSF Chimera, and Blender.
https://orcaforum.kofo.mpg.de/app.php/portal
https://www.rbvi.ucsf.edu/chimera
https://www.blender.org/