The screenshot left shows a simple random walk in a path with two robots. Even if the picture is provided in maximum resolution it remains unclear what the meaning is of all these pixels. Human can guess that the connected nodes are the allowed path, but computers have no idea how to interpret the image.
The situation becomes much clearer by activated the pause mode shown on the right. There is an additional textual window which explains, that the red circle is robot1 who is moving from node #4 to #5 and has a full battery. These information can't be parsed from the original picture so the text box provides additional meaning. Another feature of a text box is, that computer will understand the information much easier because all the data are formatted in a key value syntax which is the prefered layout for machine understanding.
Such a text box is the core element of Artificial intelligence because it adresses the symbol grounding problem. The text box communicates the current game state to an external instance which is a human observer. Instead of analyzing how the simulation was programmed internally the new question is how to talk about the domain in natural language. Such a task is realized with a user interface in general and with a text box in detail.
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