A number of other presentational devices were used, the main one of these being the analogue clock. To allow enough light onto the model, a light was fixed onto the camera to shine onto the clock and other idents; this light was not used on the main ident however, which was internally lit; in any event, the mirrored background would have reflected the external light back at the camera and caused glare. The clock was mechanical, and featured numerals indicated by double lines that increased in thickness the further round the clockface. The clock also featured a 'polo' mint centre. The clock is quite distinctive, and became strongly associated with the BBC. The clock's colour and legend never differed from that of the main ident.