Maybe it's part of our biological imperative, but there's something rather satisfying in seeing interlocking parts. Coming across a perfect spatial match in the wild, though, is too often restricted to chance encounters with Russian nesting dolls, so it's about time there was a blog devoted solely to Things Fitting Perfectly Into Other Things.
Years ago, the Things Organized Neatly Tumblr made a splash by giving control-obsessed types a daily fix of order. Now, Things Fitting Perfectly provides a similar comfort by showing objects neatly organized into each other. Unlike the Russian nesting dolls, though, these objects weren't literally built for each other; they somehow found each other like Adélie penguins--it's as though that Legend of Zelda cartridge for Nintendo 64 was destined to be with that Sephora box forever and ever.
Have a look at more objects that found their purpose in the slides above.