The superheroes at the center of Avengers: Age of Ultron resonate so strongly with so many people because they’re so deeply entrenched in popular culture. Captain America, Iron Man and the Hulk were around for years before Chris Evans, Robert Downey Jr. and Mark Ruffalo were even born. These aren’t just characters – they’re icons. And while serious comic book nerds know how much Earth’s Mightiest Heroes have changed with the times, taking a look back at what the likes of Black Widow and Hawkeye and the Vision used to look like is both entertaining and (dare we say it?) educational.

A very cool new interactive gallery (via Shirts.com) gives you the chance to compare Marvel heroes of 2015 to their very first comic book appearance. Some characters, like Captain America and an Vision, have retained all of the same elements. Others, like Thor and Scarlet Witch, look like completely different characters. And then there’s the Hulk and Nick Fury, who began as grey and white before becoming green and black. But Quicksilver? That guy’s barely changed at all.

Check out the images for yourself below and make sure you toggle them back and forth. This is a time waster that is actually worth the wasted time.

Avengers: Age of Ultron opens on May 1.

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