This image is an effective metaphor for gravity. Another example of the important role that graphic imagery plays in understanding is in the story of James Watson' and Francis Crick' struggle to discover the structure of the DNA molecule. Once, while discussing their problem, they described the DNA structure as a ladder. Unfortunately, that structure did not reflect the evidence. It was not until they visualized twisting this ladder like a corkscrew were they were able to explain how the DNA molecule is built - as a double helix.
Graphics are a powerful teaching tool.
They can be used to explain, and to stimulate. It is important that the graphics are complimentary to what is being taught. Irrelevant graphics are nothing more than a distraction that interferes with learning. Adaptability Educational computer software should adapt itself to the student. This means taking the student's current knowledge and skills into account when presenting the student with activities, information, or problems.