Although our visual perceptions of objects are discrete because of our saccadic movements, we perceive objects as moving continuously. We evolved to interpret our sense data, and not just visual sense data, in terms of continuous motion. Perceiving motion as continuous may have evolved very early among vertebrates. It would be interesting if there were an ability analogous to the ability to recognize a grammatical sentence. In the Shannon quantitative measure of information, there is just as much information to be obtained from the pattern of saw marks on the boards of my office wall as there is about what is available for lunch or what can be obtained by research on artificial intelligence.
Curiosity needs to be focussed on what is potentially relevant to the baby or robot.
Part of the answer is that curiosity is focussed on getting more information about kinds of object that have been identified. Certain appearances are usually noise, e.g. shadows. The child may be predisposed to regard shadows as noise, i.e. to regard an object as continuing through a shadow and to ignore the edges of shadows. The recognition that a goal is achievable because it is either already achieved or all the preconditions of an action that achieves it are achievable. This can be regarded as the grammar of a specific language GR, but unlike the grammar of a spoken languages, the grammar of GR is universal.