Well here is another uncanny chair for you, something that does more than just helping you sit down pretty.
Apparently the chair comes with an impromptu helmet, something which is actually the backrest of the Mamoris chair. You can use the said helmet by disengaging it from the chair, potentially handy when uneventful earthquakes or other calamities strike.
This apparently explains the uncanny backrest shape of the chair, which should be a great protector for your head and neck.
The chair is a prototype for now and while its intent seems to be mixed yet disaster-ready, such a chair should be a great solution for folks residing in frequently hit quake countries like Japan.