I was reminded of animal adjectives in Improv Games when Pavarotti described the voice as a horse in elegant, wild control. My favorite part of the video is where he uses his hands to describe the tube of sound for the "ooh" vowel. I think much of this wisdom applies to playing the flute as well. Changing the inside shape of the mouth can affect the tone color and intonation of the flute. After lots of experimentation with the different vowel shapes while playing the flute, I think now I subconsciously alter my vowel shapes to work with the intonation & tone color on flute. For example, a lower flatter tongue - like a yawn - tends to have a lower pitch and a more "open" or "full" sound, whereas a tongue that's pointier and more forward tends to have a higher pitch and a brighter or thinner sound. What do you think?