Each group needs:

• Pier (Column) Design Worksheet
• calculator
• measuring stick or ruler with 1/16-in (1-mm) marks
• weights for measuring, totaling at least 7 lbs (3 kg), such as weights, books or a coffee can filled with coins or rocks
• (optional) sculpting tool, such as a metal spoon or scissors to cut clay, foam and marshmallows

For the entire class to share:

• modeling clay pieces, ~ 2 in x 2 in x 3 in tall (~5 cm x 5 cm x 7.5 cm)
• 1 bag large-sized marshmallows
• high-density foam, about 1 ft² (9 dm²) by 1-2-inches (2.5-5-cm) thick; available at fabric and craft stores
• scale, to weigh books
• scrap paper and tape, to note book weights on each book
• tape, to hold marshmallows together
• (optional) wax paper or plastic wrap, to keep clay moist before use
• (optional) toothpicks (if students redesign using "reinforced" materials)