The 8D Display combines a glasses-free 3D display (4D light field output) with a relightable display (4D light field input). The ultimate effect of this extension to our earlier BiDi Screen project will be a display capable of showing physically realistic objects that respond to scene lighting as we would expect. Imagine a shiny virtual teapot in which you see your own reflection, a 3D model that can be lighted with a real flashlight to expose small surface features, or a virtual flashlight that illuminates real objects in front of the display. As the 8D Display captures light field input, gestural interaction as seen in the BiDi Screen project is also possible.