Mouryou no Hako is an excellent detective anime, dark and unusual.
The story looks incomprehensible at first, but it is amazing how every little piece fits in its place in the process. It is thrilling and upsetting , but full of intelligence.
Animation is fluid and very pleasant to watch, while the caracters have the caracteristic beauty of Clamp works.
The sound score and voice acting are completely fitting.
The characters despite their number are quite memorable.
This show is disturbing and brilliant, with excellent direction and a compelling story. I recommend it to anyone enjoying intelligent, dark detective stories, but it's definitely not for someone who easily has nightmares :)
(I wonder, could I put an image in the anume entry? It's a pity it's blank! :P)