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The Observer Block received some significant changes in the most recent snapshot, some of them breaking or improving various things that could be done with the block. Xisumavoid goes over some of these changes, demonstrating the more relevant changes as they relate to many crazy creations made since the Observer Block debuted some snapshots back.
16w41a brought with it a few other changes of note, which Xisumavoid also goes over. Mainly fixes, they nonetheless are noteworthy.