What's the biggest difference between working by hand (illustration for instance), and working on the computer? It is the absence (or presence) of Ctrl Z. When you draw by hand, you can't undo things easily. The thing drawn remains drawn (dammit!).
The Ctrl Z (or undo option) has changed the way we work and the way we think. Since everything can be undone, sometimes nothing is done very seriously. On the other hand it emboldens us to try new things, however stupid they may seem. Ctrl Z is forgiving. It tells you, you are human, you can do it again, don't sweat it. When you work by hand, you are slower and surer, because you have to be. It is old-school. Working by hand takes the examination first and gives you the education later. If you fail, you start all over. Ctrl Z has taken the edge of drawing. It has given us a plan B. Ctrl Z (Command Z) is a state of mind, which becomes a whole way of working. You can take three leaps forward, because you know that you can always reverse in minutes. Ctrl Z has created a culture of impatience, but also a culture of limitless experimentation.
The digital camera has been the Ctrl Z culture of photography. Previously, people used film. It had to be loaded, used, wound, spooled, developed, fixed, and finally printed into a contact sheet. The long process ensured that we carefully composed our shots, and only took a shot if we were pretty sure that was what we wanted. You ended up with photos that were fewer in number, but better in quality. With the digital camera you may shoot hundreds, and still may not turn out with a great one. That's because we shoot without thinking.
Ctrl Z has made us (among other things):
Since humankind is at that incredibly exciting stage of leaping from the Gutenberg era to the iPad era, both eras stand to gain the best from each other. And in the process both are evolving almost faster than we are.