Arches Are Weaknesses
A teacher's da Vinci quote about arches insults the students into collaborating, against the teacher.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-08-10-arches-are-weaknesses/ (CC BY-NC 4.0)Transcript
Students: "Why are you making us work together?" Teacher: "Teamwork is great! It's like Leonardo da Vinci said..."
["An arch consists of two weaknesses which leaning one against the other, make a strength." (drawing of an arch)]
Students: "Are you calling us weaknesses?" "I feel threatened! Unsafe learning environment!" Teacher: "See? You're already teaming up against me. Collaboration!"