Writing in Make, engineer-dad Saul Griffith proposes a "curriculum of toys" that adapts the toys around our kids to provide a curriculum that teaches all the important subjects for a happy, well-informed life.
1. Drawing. Being able to draw sufficiently well to communicate your ideas is critical, especially for future makers. You don’t have to be Rembrandt, just learn proportion, perspective, and how to represent 3D objects on the 2D page. Chalk and a sidewalk, pencil and paper, an Etch-a-sketch if you must.
2. Sculpting. Understanding three dimensions and producing 3D forms. Play-Doh, Fimo or Sculpey, clay, sandboxes and beaches, food, aluminum foil, paper and origami.
3. Knots. It frustrates me that so many people know so few knots. Rope can help you do almost anything. String or rope, kites, sewing, knitting, crochet, sailing, rock climbing.
4. Joining Things. Gluing, nailing, soldering, welding, tying, lacing, riveting, taping, stitching, screwing. Most of these are cheap to learn — give them an old log, a hammer, and a bag of nails, and let them bang nails until that log looks like a rusty hedgehog. Nearly any craft project or model kit.
5. Shaping Things. Cutting, sawing, chiseling, whittling, sanding, grinding, drilling. Give kids real tools, not plastic versions, at any age. Woodworking and metalworking toys, most craft projects, origami, a penknife, scissors.
6. Forces. Gravity, levers (moments), projectile motion, friction, pulleys, mechanical advantage, gearing and gearboxes, torque. Mobiles, trebuchets, magnets, juggling, throwing and ball sports, board sports, sailing, seesaws, slides, Lego, and bicycles!