Then Mr. Bosland was told of the Bhut Jolokia, or ghostpepper, a variety grown in remote Assam, India, that was being studied by the Indian army for use in grenades.
For the projection aspect, a San Diego company called AV Concepts used a variation of a visual effect that was discovered in the 19th century, known as Pepper's Ghost.
"Pepper's ghost" isn't the sort of phrase you hear very often at a show like SXSW. In amongst all the latest generation technology, there aren't too many folks discussing hundreds years old optical concepts.