Silent way: How to Use Cuisenaire rods

Though primarily used for mathematics, they have also become popular in language-teaching classrooms, particularly The Silent Way. They can be used

to demonstrate most grammatical structures such as prepositions of place, comparatives & superlatives, determiners, tenses, adverbs of time, manner, etc.,
to show sentence and word stress, rising and falling intonation and word groupings
to create a visual model of constructs, for example the English verb tense system .

Donald Cherry explains how to use them in a series of youtube videos, the following video is just one of them