Instantly recognisable from zombie and disaster movies....and seen day to day in hospitals, chemists, laboratories, vets - anywhere, really, that there are areas or vessels which contain biological contaminated materials (blood, needles, tissues etc)
Another symbol which fascinates me. it was created in 1966, with the intention of being a completely unique memorable yet [at that point] meaningless symbol, the criteria for its design was:
I create these by carefully hand folding the individual pages of books. Just folding. I do not cut or harm my books in any way.
Photos shown are of past pieces, most of which have gone to their new forever homes.
Exact colours and final appearances naturally vary from book to book.