Unsiegable Icosagon Sand Castle Mold

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Castles like these were constructed with outward walls at an angle to deflect the inertia of incoming cannonballs. As a result, rather than hitting the walls directly and causing maximum damage, the cannonballs would ricochet off the wall and sail over the castle, resulting in significantly less destruction. The angled walls also created greater challenges for besieging the castles, allowing more archers along the walls to defend and reducing the area where the opposition could operate. This made it easier for archers to hit their targets, increasing the chances of successfully repelling an attack. If you're interested in learning more, I'd be happy to provide additional details about the construction of these castles and the techniques used by their designers.