Restive shadow: animating invisible shadows for expanding shadowgraph experience. - Saki Sakaguchi; Hikari Tono; Takuma Tanaka; Mitsunori Matsushita (SIGGRAPH ASIA Emerging Technologies, 2013)

Slanting shadow: changing invisible shadow shapes by rotation for expanding shadowgraph experience. - Saki Sakaguchi; Hikari Tono; Mitsunori Matsushita (SIGGRAPH ASIA Emerging Technologies, 2014)

Basic study on creation of invisible shadows by using infrared lights and polarizers. - Hikari Tono; Saki Sakaguchi; Mitsunori Matsushita (SIGGRAPH Posters, 2014)