I have arrived outside the city! (Cell Wall)

I just got to the city of Cell after a long trip and I am ready to go in. I have arrived at the outer layer of the city, which is pretty rigid and strong. The people who built the city used a very interesting material called cellulose! This wall offers protection to the city and allows people (such as some people I met named H₂O, O₂, CO2) to diffuse in and out of the Cell. This wall is also built upon to provide support and grow the cell.
Here is a view of the city from the sky! (I put a line to the cell wall).