This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:" http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html スペース 科学 脳 58294main_The.Brain.in.Space-page-75-asian-kid-head-twist
set of cyclic, cycle concentric rings. revolved spirals, vortexes, whorls. abstract circular, radial loop shapes, elements スパイラル ベクトル 渦巻き Spirals, swirl, twirls set. concentric, radial graphics
set of cyclic, cycle concentric rings. revolved spirals, vortexes, whorls. abstract circular, radial loop shapes, elements スパイラル ベクトル 渦巻き Spirals, swirl, twirls set. concentric, radial graphics
set of cyclic, cycle concentric rings. revolved spirals, vortexes, whorls. abstract circular, radial loop shapes, elements スパイラル ベクトル 渦巻き Spirals, swirl, twirls set. concentric, radial graphics
set of cyclic, cycle concentric rings. revolved spirals, vortexes, whorls. abstract circular, radial loop shapes, elements スパイラル ベクトル 渦巻き Spirals, swirl, twirls set. concentric, radial graphics
set of cyclic, cycle concentric rings. revolved spirals, vortexes, whorls. abstract circular, radial loop shapes, elements スパイラル ベクトル 渦巻き Spirals, swirl, twirls set. concentric, radial graphics