01 Cone shape forms at top of tower through the sue of wedge shaped gaps.
One group used an interesting technique to bring the top of their construction in narrower. This method (shown in my photograph above, and sketch below) essentially used wedge shaped gaps to decrease the circumference of the tower.
ENVS10003 Brigitte Kelleher - Logbook This group started their structure with an oval shaped base. Their structure was significantly wider than every other team’s structure. Because the structure was so much wider, it used many more resources and took much longer to gain height. This very wide base gave the team a large disadvantage and their structure could not keep up with other structures.
Similarly to the structure on the left, this structure started with a very wide base. As shown in the image above, this team created a spire at the top of their tower by slowly moving the blocks inwards. This allowed the structure to get taller using minimal resources.