Multiple i2c communication with 4 device

Nothing is asked specifically to do in this project. It's my wish what can I do. But my teacher advised me to do something like which will help people.

And this is not my final project. This is a small project which is related to my one Subject. Here I will calculate the Muslim prayer time using geographical location and show them in a display. And the time will automatically updated everyday in display.

In my final project I am trying to make a device that will help the blind people. Where the device will take picture and detect them and make voice command for him/her. So that he/she can know what is around him and can make decision. It can detect currency/money, people, tree, car, distance between object and many more.