The preceding section examined the extent to which Caribbean educators had improvised equipment when commercially produced models were in short supply. Among the roles of the science teacher, Silber (1979) has included that of experimenter/tinkerer, and some teachers improve on their commercial stocks for educational reasons. It may be an improvement to allow the commercial pinhole camera kit to gather dust on the shelves while the children are given toilet paper cardboard cores, carbon paper, greaseproof paper, rubber bands and pins.