There is also a special situation. In the futures market, diamonds sometimes appear at the junction of two opposite channels. For example, futures prices run to a high level in the form of an upward channel, and the parallel lines of this channel become the upper left and lower right of diamonds. Subsequently, the futures price turns down or runs in a downward channel, so that the upper right and lower left of the diamond become two parallel sides of the downward channel. Once this happens, the decline of futures prices is usually at least 50% of the previous increase.