Well the picture attached shows the basic Zline.
By definition a Zline is made of 2 candles.
Candle one's body is half the size of candle two's body.
Candle two breaks out of candle one.
Now there you have it.

Using the basic Zline you can go look for them and study when and where they occur.
How about at other Zlines of a higher timeframe?
How about at other supply and demand areas?
How about trend lines?
How about Fib lines?[/quote]
I think there is also a lightbulb moment when a trader first realises that they don't need to wait for price to retrace back to the line before getting in on any bounce - but that they can trade on the way to the Z-Line!
This is in effect how pros trade S+D, the trade they are in on is the move as price goes to the zone, not back out of it.