The affordance of large personal screens is different from the affordance of regular sized screens. By extending further into the userís visual periphery, large screens address the peripheral vision of the user and result in a natural distinction of screen space into focus and context regions. In this talk, we present a selection of interaction and visualization techniques that help users make better use of the additional screen resources offered by large screens and deal with some of the challenges brought up by these screens. Focus plus context screens turn regular screens into large screens by adding low-resolution peripheral screen space. Drag-and-pop is an interaction technique that provides users with access to peripheral screen content. Finally, we will investigate in how far lessons learned from large displays transfer back to regular and small screen devices. We will use the example of Halo, a visualization technique that supports spatial cognition by adding a virtual periphery to small-screen devices.