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Across the spectrum of design, print and gestural interfaces might seem to be on opposite ends. One is passive, the other is so active it changes with a single touch. But they do have one thing in common - they live in the non-digital world and they engage our physical body in some way. In print, it’s all about our eyes, the natural way we see things. What size type or leading is best for reading a novel? What about for reading a poster, or a banner meant for the side of a building? In a gestural interface, it’s all about touch. The natural way we grab, stroke, tap and point. How big does a button need to be so people can touch it and not its neighbor? Where does a menu need to be so my hand can use it easily? Does the angle of this swipe feel uncomfortable?

While in school, I always heard my professors repeat the same thing; print it out actual size! Get it into the real world and see how it looks, even if it’s just a piece of the whole. They hold that it is impossible to evaluate how a print design is working on a screen. I say the same thing applies to anything that will ever interact with our bodies instead of a mouse pointer. Physicality matters, accurate size matters. Providing paper printouts of a gestural interface at the size it will eventually be produced can make an immense improvement in how thoroughly the design is evaluated. It can also uncover ideas that suddenly seem obvious when you’re holding the design in your hands.

I’ve seen myself, my team and our clients do the same thing with a paper representation of the interface; if we wanted to know whether it made sense, we tapped, we touched, we drew gestures with our fingers and filled in the gaps by talking. When my team presented our ideas digitally - through email or on a projector - the client feedback was diminished in both quantity and critical depth. When we presented the design at actual size, in person, on paper, ideas and solutions developed easier, faster and more thoroughly than when we didn’t.

So if you find yourself designing a gestural interface, remember; get it into the real world, at real size, while you’re designing it. Do it early and do it often. You’ll build something better for it.