Fans of space travel can already build Lego models of the Apollo lunar lander, the Saturn V rocket that took it to the moon, and NASA’s new Space Launch System that will carry astronauts around the moon as early as next year.

Now scientists at the European Space Agency have done a bit of reverse engineering, using simulated lunar regolith to craft Lego-like bricks that could be used to construct future moon bases. The space bricks are even on display at Lego stores around the world, including the one in West Edmonton Mall.