Most iPad drawing apps take a rather old-fashioned approach. They try to mimic paper and pencil, or paint and canvas, and of course they never get it quite right, even with pressure-sensitive styluses ...

According to Arrette, "though most design work these days is being done on computers, the design process is a cycle: from the original idea, to paper, to computer, to paper, and back again many times.

Although tablets have opened up a whole new range of possibilities for architects and designers, using them for drawing and doodling is often a clumsy experience. In many cases there's far too little ...