A childhood belief about in the street

The first time I ever saw the Rose Parade on TV the announcer said something like "the floats are all made entirely of flowers." I took him literally. I did not understand that they were DECORATED entirely with flowers. So I wondered for several years thereafter, how the floats were able to move under their own power -- how, in other words, one could build a working engine, tires, and all the rest, entirely out of flowers!