[thanatos519]

Duplo is Lego-compatible. A 2x4 Lego brick fits exactly onto 1x2 Duplo studs. A Duplo brick is 2x the height of a Lego brick, and a Duplo plate is 1x the height of a Lego brick.

It's fun to build large structures quickly with Duplo then detail them with Lego!

[jacquesm]

There are even ways to connect Modulex bricks to regular Lego, some people have figured out some interesting tricks.

Which allows you to take that strategy to the next level.