Thank you for your comment! Iteration is in the works right now.

I wrote this script at the weekend:

    Load["./bus.jpg"]

    In[Detect["person"]]
        Greyscale[]
    Endin

    Show[]

In[] is our iterator (which came from "in a folder", which was the original use). I'm adding data types. In the above program, In[] is iterating over a Detection object. Behind the scenes, each bounding box is selected, the nested statements (in this case, Greyscale[] are evaluated), then any transformations are applied to only the regions in the bounding box.

Thus the impact is:

    1. Load a file
    2. Find all the people
    3. For each person, turn that region greyscale
    4. Show the resulting image

My rationale for implicit state (I haven't heard that term until now -- thank you!) is that it may be more intuitive for a beginner. Maybe that will be wrong, but I'm eager to experiment!

(I am beyond elated to be on the front page of HN!)

(edited to get the code snippet and list formatting right!)