USDCAD 1H WHAT DOES TRADEABLE OPEN SPACE MEAN

Look to the left at the past candles.
Trade 1 had a long body bearish candle to the left so price is rising through that space now.
Above trade 1 box you see several candles in a consolidation sideways move which creates a resistance zone.
If price can break through that resistance zone then you see to the left several long body bearish candles.
This will be the tradeable open space for trade 2 to pass through in a bullish trade.

הערה:

Price is moving through 2nd trade open tradeable space