A matryoshka (or Babooshka) is a set of dolls that are placed one inside the other. Art Lebedev uses this popular nested doll mechanism in their nerdy Matryoshkus Nero.
Matryoshkus Nero is a set of Matryoshka dolls that corresponds to data sizes: bit, byte, kilobyte, megabyte, gigabyte and terabyte. You start with the terabyte and keep going doll by doll till you reach the bit.
It's a fun, educational toy for young geeks and it looks pretty sleek in shiny black.
The Matryoshkus Nero sells for about $50.
If you do not want to educate yourself, you can just enjoy the naughty stripping Matryoshkas: