1. Virtual and real are relative categories in design, where the difference between physical and virtual is not important. What matters most is the interaction between the user and the artifact.
2. Design exists in the relation between virtual and real. Designers create in both the virtual world of sketches and the real world of physical objects.
3. Computers now allow designers to see how a virtual design will work throughout the design process, making the virtual design more real than traditional physical prototypes.