# Dynamic Arrays and Strings

As it will become clear later on, working with constant-size data structures allows us to organize values in an *efficient* matter. However, perhaps the biggest drawback of constant-size data structures is that we cannot adjust the size to meet our demands. 

Consider a painter that wishes to keep track of the paintings he produces in a list (we assume each painting can be represented by an arbitrary integer). 

```solidity
contract Painter {

    uint N = 100;
    uint[N] paintings;

}
```

Although we can change `N` to be whatever size we want it to be (at contract creation time), its pretty obvious to see that when the painter paints his `N + 1` painting, there will not be enough space in the `paintings` array to store his painting.

*Dynamic* *types* allow us to create data structures whose size is not fixed. Furthermore, learning about dynamic types will allow us to focus our attention towards strings.