MediaWiki:Wikifeatures-feature-description-wgEnableCategoryExhibitionExt

What this does is allow the listing of the most popular eight pages a category by name, recency or popularity — but as image links. Tangerineduel and CzechOut agreed that category picture display was a no-go back in the very early days of CSS customisation, which ruled this extension out.

However, it was further ruled out when we switched over to some javascript that emphasised alphabetisation as the principle organising metric for categories. It's not believed that the alphabetisation code would be compatible with this extension. Please, in other words, don't enable this extension.