Last week, we talked about the weird way that sand can spawn floating in the air during world generation but drop down as soon as you disturb it, causing landslides. The more experienced of you will know that this happens when you change an adjacent block in some way.
That's a pretty handy property, which can be used to make all kinds of interesting creations. Until pretty recently, if you wanted to make your own block update detector then you had to manually set it up using complex redstone mechanisms, but version 1.11 of Minecraft introduced a block that does everything for you. And it just so happens that it's this week's Block of the Week - the Observer!
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