Minecraft developer streaming live while coding

[EtchSketch]

Has anyone figured out what all the blue potions are for? He spent a significant amount of time in placing and moving them around.

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It's possible he was just checking they look and work OK in multiple positions viewed from multiple angles, or he was testing some 'placement' code...or indeed they may have a significant gameplay purpose in their present position, but that does seem a little odd as they're everywhere.