Matrices as high-dimensional proportionality constants (比例の高次元化と行列),
A lecture for high school students at “Open Campus”, Shizuoka University, 2007-08-03. (in Japanese, slides) (in Japanese, handout)
Quivers and categories (クイバーと圏),
A lecture at Science Café in Shizuoka, 2009-07-30. (in Japanese, handout)