The model of the speech circuit proposed by Ferdinand de Saussure in "Course in General Linguistics" (1966 [1916]). A conversation is an exchange of vocalized mental signs. The drawing uses the oak clipart by rg1024 http://www.openclipart.org/detail/colored-oak-tree-by-rg1024
Shiny transparent water bubbles in a vector format pattern. Different sizes of shiny realistic bubbles and tiny dots. Free water bubbles pattern for all hygiene, liquid, foam, sea, swimming, underwater, aquatic animals, breathing underwater, bathroom, bath, shower and cosmetic products designs.