Symmetric Arm Parts
The parts of the limbs attached to the left and right are parrying while wearing a stream of water, and each acts in a complicated manner to create a glossy wave motion.

Horizontal fall
The flat body that imitates the crab falls slowly while maintaining the horizontal posture with the left and right arms as balancers. This is exactly the crab itself.

Fall speed
The body design with a recess on the ventral side of the body to receive moderate water in order to reproduce the unique fall speed of a crab that is neither too slow nor too fast.