https://en.wikipedia.org/wiki/Metamaterial_cloaking
woven optical calcite (or similar refractive index material) shell for cloaking
https://en.wikipedia.org/wiki/Calcite
https://www.azom.com/article.aspx?ArticleID=7784
https://interestingengineering.com/invisibility-cloaks-are-no-longer-just-science-fiction