SPLIT SCREENS
In this category we find a selection of sites that all split the screen using a vertical divide. There are perhaps many reasons to do this, and in surveying many samples of this type I have found two main reasons.
The first is that at times a design can really have two primary elements of equal importance. A common approach to web design is to rank things in order of importance. This importance is then reflected in the hierarchy and structure of the design. But what if you actually have two things to promote? This approach allows you to give prominence to them both and allow the user to rapidly select between them.
The second reason I have found for this approach is that sometimes you need to convey an important duality. Consider the Eight and Four website for example. Here they want to convey the fact that their core strengths are their digital roots and their talented staff. This pairing is what defines them. The split screen is a lovely way to present this. And I especially love how the ampersand unifies the two sides.