As part of our Inquiry topic of Bridges we tested the strength of a cylinder shape today. We found that most bridges have supports which are cylinder shape somewhere in there construction. These are usually sunk into water and hold the frame of the bridge up. We rolled 6 pieces of paper up and placed a maths text book on them. Then we started stacking. And we stacked, and stacked and stacked until we had 33 maths text books on the cylinders. Eventually the 'compression force' of the weight of the books made the cylinders collapse, but it demonstrated the strength that a basic shape can have and why they are used in construction.