How might the "shell" in this picture be manufactured? What process could be used to achieve this geometry? It is made from plastic.
It might also have been made by thermoforming, in which a flat sheet of plastic is heated until it softens and then pressed against a replica of the finished part and allowed to cool and harden. If the process of conforming to the replica is aided by applying a vacuum in the space between the sheet and the replica, the process is called vacuum forming. this is popular for making large objects with thin walls especially if the finished part must be inexpensive.