I'm probably showing my ignorance of what is possible/required, but I'd like to see a GUI front-end for Git that looked like the background of this image, where

I'm probably showing my ignorance of what is possible/required, but I'd like to see a GUI front-end for Git that looked like the background of this image, where each commit was a lozenge that I could just drag from one column to the other. Maybe individual files could be circles inside the lozenges. Just drag-and-drop, and the front-end figures out all the underlying Git commands to use.