By popular request (OK - Genete was asking for it)
Along with the walk/run cycle, another thing you tend to notice in cartoons after you watch them for a bit, is the repeating background. Tom and Jerry run down a seemingly endless hallway in their house. Wile E Coyote chases the roadrunner past the same rock formations and cacti for miles.
For an example, see - jimmcneill.com/loopdemo.html
They’re looping backgrounds. Show us your best looping background, created in Synfig!