Where they show up

A block forms only where a trend ends. That single fact decides which charts are worth searching.

More turns, more blocks

Small timeframes end trends far more often than large ones.

The daily gold chart may produce a handful of blocks in a year. The 4 hour chart and everything below it produce them often enough to actually study.

Look on the 4 hour chart and lower if you want examples to work with.

The turn is easy to see on a large chart

Start where the turn is obvious. On a daily chart the sweep and the close past the last swing are visible at a glance.