240 Personal Content Experience: Managing Digital Life in the Mobile Age Figure 6-22. An example of an image grid without labels. Figure 6-23. An example of a tree view. Presenting content objects that have temporal relations is straight- forward by using conventional calendar views. In Figure 6-24, for instance, a day is presented as a list or a grid for displaying a week, that are familiar and the interaction is suitable for mobile devices. The rightmost view in Figure 6-24 illustrates a problem related to the use of empty screen space (no events in the calendar). If the days