Tapping an item will select it and possibly show its contents in the next layer.
To enlarge an item it can be opened. This is done by double tapping the item.
Some items contain extra textual information. Their purpose is to communicate a slightly longer message, instead of the name or image of the item. When such an item is closed (either selected or not) its name and/or image will be visible. When it is opened, by double tapping it, the message will be displayed.