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It’s worth pausing for a moment to look more closely at the arc we discussed in the previous post. This arc was created by rotating the triangle’s side so that the top point A, aligns with one of the grid's verticals.

In the image above, I've highlighted the angle of this arc in yellow and reported it to the hand gestures of James and Thomas. As we can see, the angle formed by their hands is strikingly close to the angle of the arc – hence the name I've given it: the Arc of Thomas.

The Arc of Thomas has already provided us with the height of the windows, but it has yet to play another important role.

Thomas raises his index finger towards the sky. Could he be giving us a clue ?