Challenging people to break their everyday routine and take some time to engage in a playful manner with an unexpected material.

Metaphorically, walking on eggshells is used to describe a person who is trying very hard not to upset someone or something. This is based on the idea that eggshells are easily broken. In cracked it! the ground will be covered with eggshells, creating a rare experience where people are asked to walk on eggshells, breaking both the literal material and the metaphorical boundary.