The folk of the Imperial Agri-world of Dreah are literally a grey people -- they, for example, have a grey skin, hair and eye tone, which exactly matches the grey flora, fauna, sky and waters of their notoriously dull and grey planet. Traders are able to make large sums selling exotic dyes to the Dreahans. More unsavoury merchants have found a ripe market for hallucinogenic drugs, as Dreahans are particularly fond of the bright colours such substances make them see. The Planetary Governor is attempting to crack down on this trade, with little success.