Mis.Aya Tsukioka is quite famous young designer in Japan.
She make some funny series of works named "New Mission - Hide and Seek"("Shin Kakurenbo Dai Sakusen" - This is Japanese) since 1999.
I once see her "Portable Manhole" that use for hiding from your dislike person at street.
If you have interest for her work and Japanese subculture,visit her website. http://www.tucky7.com/1top/index.html
(Sorry,English version is still under constraction.)