see mobile colour effects for the first time, is that they are introduced to a number of colours which they have never seen before and to which they can give no definite names. The colour-organ is, in fact, an easy means of producing those ranges of colour which it is difficult or impossible to obtain by means of paints, dyes, or other pigments, and which are rare in nature or in other forms of art.
As already mentioned, the chief difficulty in appreciating colour-music at the outset lies in being unable to appreciate rapid changes of colour upon the screen. Some persons do not feel this difficulty at all, whilst with others it only disappears after some weeks of training, but as it disappears the desire for increased rapidity of change steadily grows. At first the succession of chords can hardly be slow enough to give satisfaction, while later on and after more experience the contrasting effect of extremely rapid passages is eagerly demanded by the eye and by the mind. This is interesting as showing the educative effect of colour-music upon the powers of the eye.
It is not easy to account for this difficulty as
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