But the simplicity must not be barrenness nor the bright colour gaudy.  For all beautiful colours are graduated colours, the colours that seem about to pass into one another’s realm—­colour without tone being like music without harmony, mere discord.  Barren architecture, the vulgar and glaring advertisements that desecrate not merely your cities but every rock and river that I have seen yet in America—­all this is not enough.  A school of design we must have too in each city.  It should be a stately and noble building, full of the best examples of the best art of the world.  Furthermore, do not put your designers in a barren whitewashed room and bid them work in that depressing and colourless atmosphere as I have seen many of the American schools of design, but give them beautiful surroundings.  Because you want to produce a permanent canon and standard of taste in your workman, he must have always by him and before him specimens of the best decorative art of the world, so that you can say to him:  ’This is good work.  Greek or Italian or Japanese wrought it so many years ago, but it is eternally young because eternally beautiful.’  Work in this spirit and you will be sure to be right.  Do not copy it, but work with the same love, the same reverence, the same freedom of imagination.  You must teach him colour and design, how all beautiful colours are graduated colours and glaring colours the essence of vulgarity.  Show him the quality of any beautiful work of nature like the rose, or any beautiful work of art like an Eastern carpet—­being merely the exquisite graduation of colour, one tone answering another like the answering chords of a symphony.  Teach him how the true designer is not he who makes the design and then colours it, but he who designs in colour, creates in colour, thinks in colour too.  Show him how the most gorgeous stained glass windows of Europe are filled with white glass, and the most gorgeous Eastern tapestry with toned colours—­the primary colours in both places being set in the white glass, and the tone colours like brilliant jewels set in dusky gold.  And then as regards design, show him how the real designer will take first any given limited space, little disk of silver, it may be, like a Greek coin, or wide expanse of fretted ceiling or lordly wall as Tintoret chose at Venice (it does not matter which), and to this limited space—­the first condition of decoration being the limitation of the size of the material used—­he will give the effect of its being filled with beautiful decoration, filled with it as a golden cup will be filled with wine, so complete that you should not be able to take away anything from it or add anything to it.  For from a good piece of design you can take away nothing, nor can you add anything to it, each little bit of design being as absolutely necessary and as vitally important to the whole effect as a note or chord of music is for a sonata of Beethoven.