Where Victor Gruen simply used a hunch to invent window shopping virtually any store from IKEA to your local grocery has a trove of big data at their fingertips.
Of course you could always use a switch or remote but this paints a tempting picture for the " touchy" control freak who's so " sensortive" he gets " teckled" about the internet of everything being at his fingertips.
I'm just using my fingertips today because I want, again, a very natural dewy look and I find that I get that best when I just applied with my fingertips.