These are created by a rather complex formula and represents time as product of a series of logarithmic and exponential decoding steps. The $NDX is fighting a declining Magenta trendline, and the $SPX is up against two of them, one major (declining and red) and one minor(steeply declining, dashed, and dark blue) trendline. The $SPX is also in the proximity of a time value, near .500 (on the X-Axis) where changes usually occur.
The last chart shows the $NDX right at one of it's .500 time points (I call them nodes). These are why I agree with Steven Vincent's assertion of major changes. The .500 node point is usually associated with these kind of changes...
Nodes are related distantly to Fibonacci time extensions, but more common (once you know how to find them), and quite bit more reliable.
Exponential trendlines are straight on these charts, plotted on exponential time. Plotted on normal linear time, these trendlines are curved...
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