Throughout the many different Transformers continuities in the years, several different ways of reproduction have been revealed. A robot could be either constructed entirely from scratch and then activated, forged and then infused with life or created inside another robot. As far as I know these are the only ways of reproduction for the transformers race since they can't have sex, right? In the live-action series it has originally been established that their origin ties with the AllSpark, which "holds the power to create worlds and fill them with life". Now, to me this implies that the Cube only gives life to already built bodies or machinery and not that it actually constructs the object and then vivifies it. This could be confirmed based on what we see in the first film, the so called "AllSpark mutation", which is essentially what happens when machines are affected by a energy pulse emitted from the Cube, it brings them to life. We don't know much about the Cube's backstory and nature but I assume most of the Decepticons and Autobots were not created by it, as even though both seem to share the same radioactive aura, the ones given life by it in the 07 as well as the 09 movie appear to be mindless beasts, non sentient, whereas Prime, Megatron and rest clearly are "alive". My guess is that the Quintessons forged and used the AllSpark simply as tool to give life to the robots on the assembly line, meaning that mindless units first had to be designed and then have their spark ignited. Also what if the mighty AllSpark did in fact create many other worlds as Optimus said that it could create worlds. What do you think?