Cool things you can do with models
It's possible with Razor to define functions for rendering HTML, we can leverage our strongly typed models when doing this, and even provide overloads for different types of models, that will automatically called for different models using dynamic
Now, it's not recommended to create a single template and doing all the rendering via razor function, but it can be quite nifty for rendering search results, and so on.
A thing that's important to note here is that RenderContent is called from a codeblock, and not as @RenderContent((dynamic) Model); the reason for this is that if you try to use the latter, razor will expect for the function to return something for it to render.
By casting the strongly-typed to a dynamic when calling the RenderContent method, you tell C# to do late runtime binding and pick the proper RenderContent implementation depending on the actual CLR type of the content object. Using dynamic here is OK and will not pollute the rest of the code.