A sonic sensor detects a person which activates 8 of the 10 drums to rotate. The selection is random which means that thousands of poem combinations are formed. Each drum contains a category of word such as verb, adverb, adjective or noun etc. This means that whilst the specifics of the poem always changes the structure of the poem remains the same. Any drum can be slotted in or out and therefore replaced with another 11 words in each category.