Long vs. Short

The project was choosing an event that can be depicted temporally and contently.

I chose the process of  development of people consuming energy.

I picked following ages:

Firstly, primitive people collided rocks to making spark.

Then, people built windmill.

Thirdly, steam engine was invented.

Now, we use electricity to charging our cell phones.

So I illustrate this process by a group of charging "phones".

(rock- 1% charged)

(windmill- 33% charged)

(gear- 66% charged)

(iPhone- 99% charged)

Finally, the phone is 99% charged because people still develop the method of consuming energy, it could be more environmental friendly in the future.