The famous "box problem" is a classic that never gets old. It's often taught in Algebra I or Calculus, but can be extended to every level.

Students chose a quote, created a fairly complex spreadsheet, and then spent several days in the STEAM lab using the laser cutter and miter saw to create a beautiful 3d graph.

Pattern and order is beneath all (well, almost all) that seems random in mathematics. This is especially true of the fact that (-4)(-4) = +16.

Spreadsheets quite naturally lend themselves to exploration, iterations, and the concept of infinity. This discovery based lesson elicits a deep understanding of infinity and the beauty of irrational numbers.