How I see it
A chart, is already an indior alone in the purest sense. Tick, lineup, time pub, range pub, renko, Jchart. . .etc
The core business of indiors is to organically organize the price/time data in such a way, it reflects the approximate fact of this market, into summations (hopefully with workable edges) the restricted and possibly idle (but clever in a way) human mind could comprehend immediately, and make logical decisions from it.