Batman Disappearance Question

Reader Graham asked a great question that I don't know the answer to, offhand (he also asked a Hockey question that I answered over at Sports Legends Revealed).

The question is this - When did Batman first disappear from a room (or from the roof top talking to Gordon)? Was it a long time ago, or was it a recent (i.e. 80s/90s) invention?

Everyone think of the earliest that they have seen it happen!

Thanks to Graham for the question!

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