Overall, it can be seen that there are a great number of advancements were made in size and shape of the tool during its 0.6 million years development for the sole purpose of being easier to use.

We need to acknowledge that about 1.4 million years ago, the tool was relatively primitive and resembled to the natural ones. There was a huge asymmetry in shape of the Tool A, and two sides of it seemed to be very rough. The tools’ tips were relatively blunt, which suggests that its cutting functions could be less effective in comparison with the Tool B, which was rendered to be superior. 

0.6 million years latter, the cutting tool were enhanced to be impressively sophisticated compared to tool A. Tool B was in tear-dropped shape, and its surface was much smoother than its inferior version. The side view of the Tool B was smoother and more in sharped, which could render this tool to tremendously sharp, and its effectiveness in usage was significantly increased. While the enhancement of the cutting tool was clearly seen in both its shape and size, its height was roughly remained, which was about 10cm. 

Overall, it can be seen that the envelope is much bigger in comparison to the parts beneath, and the propane is used to make hot air.

The propane cylinders are housed in the basket. The propane is then integrated with air in order to produce flame to heat the air. Next, the heated air inside the envelope is lighter than the cool air, which means it will fly upwards and cause the ballon to rise. 

Rope is designed to be attacked to skirt of the envelope to secure the basket from falling down. The burner is used produce flame to heat to mixture of air and propane. The envelope consists of panels and gores. The parachute valve, which is located on top of the ballon, is a self-sealing flap. This flap is the door that allows heated air to escape at a controlled rate.