The Principle of Polarity in Technical Analysis

The market causes some situations where resistance changes into support level and vice versa. In the chart below, an obvious example of this state is shown. In technical analysis, this concept is known as The Principle of Polarity.
If the market has an upward direction and the price increases, the resistance ceiling would be broken and turn into a new support level. The same thing can happen if the market has a downtrend, but the former support level changes into resistance this time.

It stands to reason that the price will break and leap over the levels! This breakout is a consequence of the harsh decision of buyers to invest in or sellers to sell out.

Starbucks Corporation, Daily chart (2020 - 2021)

The Polarity Principle helps traders find support and resistance levels, which are the areas buyers or sellers affect the market direction.