Éléments sur unnatural input

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@@ -260,6 +260,17 @@ In the~\ref{sec:flexiblepens} section I will describe the design of flexible pen
 
 %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