 Windows became larger, increasing the number of mullions (the vertical bars dividing the main part of the window) between the lights; above them, within the arch of the window, the tracery was formed using shapes styled 'daggers' and 'mouchettes', trefoils and quadrifoils; completely circular rose windows were made, incorporating all manner of shapes.More formal reticulated (netlike) tracery can also be found, as in Wells Cathedral.Exotic forms included the ogee arch, in which the curves of the arch are reversed in the upper part thus meeting at an acute angle at the apex; others included so-called Kentish tracery with its insertion of spikey points between the rounded lobes of trefoils and quatrefoils.