Day 511

In certain old buildings the components are far more organic than the ones we use today.
Scarcity breeds resourcefulness, you know.
Buildings of this specific time period can be identified from the red tone of their concrete.

Studies into the exact materials used have shown them to be a unique mixture.
Replications have yet to be made despite the proven durability, flexibility and resilience
due to one particular ingredient deemed to ethically unsound to use.

Human flesh - specifically muscles, pulverised and mixed with clay and local aggregate.
According to carbon dating the meat used in most of the buildings were taken between
the ages of four and five.

None of these buildings are lived in any more, not even by those who study them.
Despite their durability the cement doesn't always stay in place, it... wanders.
It leaves small piles that tend to linger around whatever moves in the houses.

Cameras show that these small forms are drawn to heat, they somehow have receptors.
In the same line that snakes do, they follow anything that produces heat.
Mice were first used for tests then rats and rabbits and so on - all ended up the same.

Their bones and skin were perfectly intact.
It was like they were just sleeping.
But inside they were empty.