ideas for new object

A few variations for the object. Still have to make a spiky one.

If i place the object in a 45 degree angle inside the tank i can control each end of the obcect as well as the middle part. The middle part can be pretty much fully controlled as it will have 4 motors pulling in different directions. But for the ends to work, the motors need to be paired, e.g. the combined value of the motors can't exceed 180 degrees -> if one motor is turned 120 degrees, the other needs to be turned 60 or less (for the object to be able to move up and down without the thread becoming loose enough to jump off the bearing. However, there may be a lot of water friction if I use complete discs?

Instead of pull each arm outwards. It will pull the arm in the opposite corner of the motor to turn / twist the arm. Similar to the kinetic snake arms. But i think this one may be impossible as the arm closest to the motor will collide with the thread.

Laser cut the base shape and connect it together with gussets. Then connect the "spikes" to the base shape with elastic band. The layers need to be pretty tightly knit together for the shape to bounce back to its original shape.

This one is a combination of an acrylic cage and silicon. With a cage like this the silicon can be attached on the inside. Would also only need a 2D form.

Another similar to the first one, just in a circle instead. I think this one has less options in terms of possible distortion. As its a circle the distortion will in way be mirrored. Also if i use rubber bands / flexible bands to keep it together, there is no way it will retain its shape. Will end up in a square.

The rubber bands used here are way too strong. It is very stretchy but requires too much strength for the servos to be able to pull it. The model itself is also way too big.