St Mary le Bow, City of London

Exquisite stained glass is the centrepiece on entering. I appreciate the little circular windows towards the top of the facade; they make you feel like you’re on a ship. They let light in, but their height makes it impossible to see out – reminding worshippers of their smallness. In religious terms, this perhaps indicates the almighty power of God, and to non-religious observers like me, the power of the planet and the hugeness of the universe.

From a construction perspective, the main advantage of such a window placement is that the glass does not have to hold any weight – this structure would hold up just fine even if the glass were damaged – the stone walls and arched ceiling form the essential structural elements. Modern glass-facaded buildings use a ‘curtain wall technique’, where again the glass doesn’t hold any weight, but instead of a massive stone outer structure, the building is supported by internal columns, beams and braces made of steel and reinforced concrete. The disadvantage being, of course, the loss of an unbroken internal space, a key component in many of Wren’s churches.