My kid is now two years old and has been using an iPhone or iPad since a little earlier than one.

There are plenty of things they learn by using these devices -- fine motor control, color and shape recognition.

This is definitely a good thing and these people that are alarmists about these new devices are being ridiculous.

Yeah -- limit access to the device, don't let them sleep with it and play with it all day -- but they are fine for ten minutes at a time.

I think the first app that was useful to my son was a drum app. a flash card app that showed a picture and spoke its name were
favorites for a long time (there were various a year ago, Food, Vehicles, Everyday Objects). Then a drawing apps and now number and
letter apps

Books have been popular -- Sandra Boynton books and Dr. Suess mostly

Seems like 4 areas.

The first (hashes) looks trinary is some way -- gut feel

The second (two sets of two lines) looks like base-16 (notice that 1 is not represented, there -- is that significant).

The third (three sybols) two are represented by the second area, the first is not -- maybe that is a translation.

The fourth looks binary.

working on it.