More information on the Grow Fins box is here:
http://www.beefheart.com/datharp/beefbox.htm
And if you don't know anything about the film to which I refer than you
can look here:
http://darkwing.uoregon.edu/~splat/video_info_60's.html#ActuelFestival
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Splat's Zappa Page
http://darkwing.uoregon.edu/~splat/zappapage.html