There's only one way to properly celebrate Tetris' recent 30th birthday, and it doesn't involve breaking out your original Game Boy. Instead, wherever possible, you should replace anything and everything you own with Tetris-themed alternatives, starting with swapping your Moleskine notebook for this tetromino-ic alternative.
Like with those old-school address books that featured alphabetical tabs on the edge of the pages, this $US10 notebook makes it easier to find a specific section thanks to coloured pages and a series of what appear to be random notches on every page. But when all stacked together, they reveal a pattern of tetrominoes that will surely have you feeling nostalgic for Alexey Leonidovich Pajitnov's famous time-waster. [Forbidden Planet International via Fancy]