This is an example of interface as navigation. There is a specific navigation but almost all of the tiles do something. This pen also includes the ability to toggle full screen (top right corner), giving the site a more app-like experience.
The design is a grid that uses CSS Grid Layout in a pretty basic form. There are some advanced concepts like overlapping and specific placement of grid items.
Learn more about my thinking in creating this app in a post I wrote here on Codepen: http://codepen.io/brianhaferkamp/post/interface-as-navigation
I've constricted the size as this should be a mobile site. Check it on out on your phone or with the developer tools for best results.