Sparrow
Veteran
We should also make the distinction between production and perception of the illusion. The conventions and skills required for the former are considerably higher than that of the latter. Hence children will be able to take part in the illusion much earlier than they can produce it.
As for the child recoiling from the drop, of course this is different because it is real space. There must be awareness that it is not a picture - lack of borders, smells and sounds for example. When it comes to 'recognizing' real space (3d) things become more complex in terms of instinct and learning. But with pictures, as we said before it is a set of current conventions that are learned.
I think its more simple than that, a young child draws what it knows at first and what it sees later. It has a cognitive reality (it represents what it knows to be there) prior to learning the graphic conventions we all take for granted later.
I suspect to a young child a 12mm fisheye and a 12mm rectilinear photo would look equally distorted because it had yet to learn which was the conventional representation
