“Spoken interaction is awkward for almost everyone in confined spaces on systems with less than 100% accuracy.”
“Gesture interaction is just as awkward in close spaces and in many instances will restrict regular use and/or in a vocabulary of “quiet-gestures”.”
“Even simple gestures require upper-arm/shoulder movements, which when you are sitting shoulder-to-shoulder impacts fellow passengers.”
“In-ear or close-to-ear (inductive) audio changes the wearers enjoyment of food and drink.”
“It is useful to think of a camera as a gun: understand the impact that bringing it out can have on any given context; only take it out if you’re prepared to use it; be careful where you point it.”