What is work--work not as mere external performance, but as attitude of mind? It signifies that the person is not content longer to accept and to act upon the meanings that things suggest, but demands congruity of meaning with the things themselves. In the natural course of growth, children come to find irresponsible make-believe plays inadequate. A fiction is too easy a way out to afford content. There is not enough stimulus to call forth satisfactory mental response. When this point is reached, the ideas that things suggest must be applied to the things with some regard to fitness. A small cart, resembling a "real" cart, with "real" wheels, tongue, and body, meets the mental demand better than merely making believe that anything which comes to hand is a cart. Occasionally to take part in setting a "real" table with "real" dishes brings more reward than forever to make believe a flat stone is a table and that leaves are dishes. The interest may still center in the meanings, the things may be of importance only as amplifying a certain meaning. So far the attitude is one of play. But the meaning is now of such a character that it must find appropriate embodiment in actual things. The dictionary does not permit us to call such activities work. Nevertheless, they represent a genuine passage of play into work. For work (as a mental attitude, not as mere external performance) _means interest in the adequate embodiment of a meaning_ (a suggestion, purpose, aim) _in objective form through the use of appropriate materials and appliances_. Such an attitude takes advantage of the meanings aroused and built up in free play, but _controls their development by seeing to it that they are applied to things in ways consistent with the observable structure of the things themselves_. [Sidenote: and in processes on account of their results]