Students arrive from YouTube with tight boxes. The top of supply is the exact wick, the bottom is the exact candle body, and any pierce is treated as a break. That habit comes from screenshots taken at the close, not from sitting through a session.
In Bangkok, New York is still running after dinner. A zone you drew at lunch will be tested by a second group of dealers. If the zone has no internal space, you will spend the evening re-drawing it, which is another way of saying you never had a zone — you had a line you were loyal to.
Our classroom rule is blunt. A four-hour supply zone includes the impulsive departure and a portion of the consolidation that launched it. We would rather the zone look slightly too wide on the printout than have you abandon it because London printed a one-pip exceedance. The invalidation is not a tick; it is acceptance beyond the zone, which we define as a fifteen-minute close through it and a failure to reclaim on the next two candles.
USDJPY is a good practice pair for this because its wicks are rude. Mark last month’s daily supply, then watch how many times the hourly stabbed it during London without closing. Those stabs are why the weekend intensive spends Sunday afternoon on unnamed charts: you feel the embarrassment of a tight box in private, then you widen it on purpose.
Leave the decorative inner lines off the wall chart. One zone, one invalidation sentence, one pair. If you need four stacked rectangles to feel safe, you are not reading structure. You are wallpapering doubt.