With the Amazon Echo, you ask Alexa to play songs, get the weather, and report scores. Those skills, as they're called, have an open API for building conversational apps. Flask-Ask is an Alexa Skills Kit for Python that makes programming the Amazon Echo super easy.
Proximity is closeness. However, elements lacking close proximity can be unified by introducing a third element. An example: an arrow connecting a text label in the margin with a point in the middle of a map. In this way a relationship or unity can be achieved between elements that are far apart but belong together.
In art, a medium is the material that artists use to create their art. It's that simple. Whatever a piece of art is made out of is its medium. The plural of medium is media. So, one piece of art can be made of one medium or several media. If you've ever been to an art museum or gallery, you've probably seen those little signs next to each piece that look something like this: 'Oil on Canvas' 'Tempera on Wood'