Out of context these seats look ridiculous, but in the realm of a dairy farm, a hyper-practical and simple solution. Notice the strap that secures the stool to the seat of the pants. The milker sits or stands without having to put the buckets down and grab the stool, also, one-legged saved on weight. This insight was pointed out:

“….a farmer told us that a seat like this was great in case the cow fell over or started walking sideways onto the milker. All they had to do was spin on the one point and could quickly stand up and move away, taking the seat with them (w/o hands), possibly avoiding injury from the cow tipping over, or stomping on them, as well as leaving the ground clear for the cow's safety."