Detail from Medicina Catholica, Robert Fludd (1629-31) |

But enough history, let's look at the picture! Trying to clean up the original I noticed that its negative is far clearer and shows more details, so that's what I've posted. The image shows a large circle at the base, with two medium-sized circles touching each other and the circle beneath them. Finally, the image is crowned by a small circle touching the medium ones.

What's Homer Simpson doing here? |

**The Question**Using the schematic diagram on the right, assume that the medium circles are half the diameter of the large one, and that the smallest circle is half the diameter of the medium ones. Take the radius of the large circle as equal to 1 unit. Calculate the distance between the centre of the large circle and the centre of the small circle.

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