Kagi Charts, as well as Renko Charts and candlesticks, were invented in Japan and came to the USA to become popular due to Steve Nison. Kagi charts correspond to a number of vertical lines tied to each other. The price action is shown by the thickness and direction of the lines. The closing prices, moving towards the previous vertical Kagi line, expand it. If the pre-determined "reversal amount" reverses the closing price, an opposite-directed Kagi line appears in the following column. The thickness of the Kagi line changes when closing prices modify previous column to make it higher or lower. That is one of the interesting aspects of Kagi Charts.