Sometimes even ordinary objects are designed with decorative patterns. This example is a Victorian ventilation grille which the artist Falcon Hildred found in an old shop that was being demolished. It was just a plate to cover a hole in the wall, but someone went to the trouble of making it beautiful. Victorians designers were inspired by the geometrical patterns of the Middle Ages, for example in the stonework of churches and cathedrals.
How did the designer of this grille make such a complicated pattern so accurately? Falcon Hildred was interested in working out how the design was made from lines, circles and arcs. He did this drawing to show all the stages, from left to right.