The unshod runners' style causes more flex in the foot's springlike arch ankle and knee and engages more foot and calf muscles blunting the impact on the body and making for a more comfortable "ride."

It was designed by John Nash in the style of Rome's Constantine Arch and built in 1827 as the chief entrance to Buckingham Palace.

By the late 14th century, the Perpendicular style replaced curvilinear tracery with straight mullions extending to the top of the main arch, connected at intervals by horizontal Bars.