This caused copious confusion for new players, who assume the
glass "tank" is like an aquarium tank and can be used to carry
water. Originally it was intended to seal in "moisture" for
sponge transport, but that has become a far less important use
case (and in fact sponge transport is probably best done just by
building submerged pathways, like the way amalgam transport is
done) and glass "tanks" are more like "display cases" now, or an
intermediate storage container that adds top access (useful for
totes).
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