|Do you know where your variables are?|
Well as one small example, in this case for an iPad, not an iPhone, the Nodelet area on the right hand side. On pm this requires you to click the link Nodelet Settings (if you can find it, and I can't offhand see where it's got to) and put in a sort code like 1, 2 etc, which the application then changes to 1.9, 2.9 etc (why is this?) and then press save (well actually I think it's called submit). The whole area could be drag and drop with a small 'x' showing on hoverOver for delete.
Here's what apple has to say about the positive use of GUI metaphors:
When virtual objects and actions in an application are metaphors for objects and actions in the real world, users quickly grasp how to use the app. The classic example of a software metaphor is the folder: People put things in folders in the real world, so they immediately understand the idea of putting files into folders on a computer.
The most appropriate metaphors suggest a usage or experience without enforcing the limitations of the real-world object or action on which they’re based. For example, people can fill software folders with much more content than would fit in a physical folder.
iOS provides great scope for metaphors because it supports rich graphical images and gestures. People physically interact with realistic onscreen objects, in many cases operating them as if they were real-world objects. Metaphors in iOS include:
In general, metaphors work best when they’re not stretched too far. For example, the usability of software folders would decrease if they had to be organized into a virtual filing cabinet.
But man, my text is prosaic and unstimulating, go into a store and play with an iPad.