In the centre image, a child was depicted so that wrong skin colour would be obvious and not subject to changing make-up fashions. The juxtaposed garish colours of the clown were such that a common transmission error called chrominance/luminance delay inequality would make the clown's yellow buttons turn white. Use of centre images in test cards were however not a new idea; RTF and ORTF in France used the Marly Horses as the central motif of its monochrome 819-line test card which was used on TF1 between 1953 and 1983, and the first French colour test card featuring a centre image of colourful roses was used on France 2 from 1967 until sometime around the mid-1970s. SVT in Sweden was also later inspired by Test Card F to develop its own colour test card, based on its earlier monochrome test cards, with a girl holding a doll in the centre image.