We created posters that spelled out colours that blend into each other. E.g. Greenishyellow, Brownishorange and Greyishwhite. The posters were attached with a crafty transparent vertical slider that held a replica of the Nirma soap bar. Whenever the replica of the Nirma soap bar glided across the centre of the word, it would spell out two separate colours. E.g. Brown and Orange; Green and Yellow; Grey and White.