%informed choice
-Multitouch and gestural are “natural”
-\cite{bolt80}
-
-%Multi-touch and gestural interfaces became mainstream in the last fifteen years with the adoption of smartphones and tablets.
-It took two decades for the technology to be ready for consumer electronics products
-\cite{wigdor11}
-
-What does natural really mean? Nature? Leverage our skills?
-
-\cite{norman10}
-
-Physical world have constrains that the digital world does not have: teleportation, telekinesis, …
-No need to reproduce the physical world, but focus on what we would like to achieve
-
-mapping between DOFs and objects manipulated
-
-In the section~\ref{sec:interactionvr} we present interaction techniques in immersive virtual environments.
+The term \defword{natural interaction} was already used before multitouch and gestural interaction became mainstream~\cite{bolt80}.
+These interaction styles are integrated in ubiquitous consumer electronics products such as smartphones and tablets for more than a decade now.
+%It took two decades for the technology to be ready for consumer electronics products
+They are nowadays refered to as natural user interfaces or NUI~\cite{wigdor11}.
+%Whether it is about food, energy, or interaction, the word \emph{natural} suggests the idea that the object it refers to is good for people, their health, or the environment for example.
+%It is the idea that what was made by the nature is better than artificial artifacts, which are made by humans.
+The first question is: what do we mean by “natural”?
+It primarily refers to waht exists in the nature.
+However gestures are not objects that can be found in the wild.
+It also refers to what comes to mind, or prior skills.
+People have skills in manipulating physical objects that we can leverage in interactive systems.
+Yet, people have different backgrounds, skills, and culture.
+Therefore what comes to somebody's mind is not necessarily the same than what somebody else is thinking.
+The second question is: is it better because it is natural?
+This is a vast question because it depend on what metric we would like to optimize: performance, learnability, guessabiity, etc.
+There is no general guarantee that gestures improve any of these measures.
+Norman discussed the concept of NUIs and concludes that what matters is not whether these interactions are natural or not~\cite{norman10}.
+What matters is that it is an alternative interaction modality for the design of interactive systems, and the same usability rules apply.
+
+Now, if the natural essence of gestural interaction is not an essential benefit for the design of interactive systems, we can think about this modality differently.
+%The physical world has constrains that the digital world does not have.
+The digital world does not have some of the limitations of the physical world.
+For example, we can easily teleport inside a virtual environment.
+We can move through objects or even fly.
+We can manipulate objects remotely, and independently to their weight, size, or shape.
+Hence, when when designing interactive systems with gestural interaction there is no necessity to reproduce the physical world.
+We should rather focus on what we would like users to achieve, and optimize metrics such as performance, learnability, and so on.
+On a practical point of view, we care about the input vocabulary, the properties we would like to manipulate in the virtual environment, and the mapping between them.
+%mapping between DOFs and objects manipulated
+For example, in the section~\ref{sec:interactionvr} we present two interaction techniques for immersive virtual environments.
+The first one is a selection technique for distant objects.
+The second one enable users to select facial expressions for ther avatar without the need to perform the same expression with their own face.
%Raycursor, facial expressions
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