It's an Inferred importance method, as other users have commented it is likely that there are some calibration metrics in there. MaxDiff is the name of the approach if you want to check out more.
Plus rabbits love cardboard. Toilet rolls and plain boxes get your surprisingly far with two rabbits! The only toys I'll buy are the edible ones - willow tunnels for example. Watching them play with something you make is part of the joy.
It's an Inferred importance method, as other users have commented it is likely that there are some calibration metrics in there. MaxDiff is the name of the approach if you want to check out more.