A Much Simpler Contraption. (Pixiv Fanbox)

Phineas and the gang decided that today, they were going to set-up a renfaire and invite everybody from town to come and visit. Of course, Isabella and the rest of the fireside girls offered to help in the construction and operations of this medieval carnival. Many different rides and booths were set-up all across Phineas' backyard, each with their own way of entertaining the people who came to visit. Upon reaching the final tent, Isabella found a plain looking stocks next to a haysack. Confused, she asked Phineas "What kind of invention is going in here?" Phineas just replied "A much simpler contraption."