I'm looking for visual language that does not require ability to read (except, say, knowing numbers 1 to 10). Does anything like this exist? I looked at Spark but that doesn't fall in to this category.

The idea is as follows: Devices like tablets and smartphones are naturally usable by 4-year old with minimal and even no instructions even if they can't read yet. Is there a visual programming language that can be implemented on such devices that is usable by just 4 year old?