Experiment:
Wobbly Jelly

If the picture is moved side to side, the jelly begins to wobble and nearly flops off the plate. Try it yourself and you will be surprised!

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Further material for this article.

Experiment: Wobbly Jelly

The jelly seems to be lying motionless on the plate – at the moment! If the picture is moved side to side, the jelly begins to wobble and nearly flops off the plate. Try it yourself and you will be surprised!
To obtain an impression of the effect, just click here and observe the animation. You can do the colour experiment later with the children. Download the templates and paint them according to the guidelines.


The wobbly jelly: If moved from side to side, the jelly almost seems to flop off the plate

This is the way to look at the template:

Hold it in front of you at a normal reading distance. Observe the picture in a dim light and move it from side to side. Now the jelly seems to move and starts to wobble. It almost looks as if it is going to flop off the plate.

What is happening here? Explanation:

The impression of warm colours, for example, brown or red, stays longer on the retina than those of cold colours, such as blue or green. When the picture is moved, the plate and the background move accordingly too, but the jelly follows a little later. A real jelly reacts in a similar way because of its sluggishness. This is the cause of this amazing effect.