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.
Definition: (noun) - As a basic principle of art (specifically of design), the definition of balance refers to the ways in which the elements (lines, shapes, colors, textures, etc.) of a piece are arranged. Balance is one of those useful terms to know, if one is to employ Art Speak.