It's all about the brick: LEGO's modular system — THNK School
Lego Spare Parts Brick 1x4 Modified with Masonry Profile Medium Dark Flesh
LEGO Bright Red Plastic Stackable Storage Brick 8 with Drawer, Children 3+ years - Walmart.com
LEGO Blue Brick 2 x 4 (3001) | Brick Owl - LEGO Marketplace
Design classic: the Lego brick | Financial Times
LEGO® Pick and Build | LEGO Bricks | Official LEGO® Shop US
EVE & WALL•E 40619 | BrickHeadz | Buy online at the Official LEGO® Shop US
LEGO Classic Large Creative Brick Box 10698 Building Toy Set for Back to School, Toy Storage Solution for Classrooms, Interactive Building Toy for Kids, Boys, and Girls - Walmart.com
Amazon.com: Lego Parts: Electric, Light Brick 2 x 3 x 1 1/3 Red LED Light (Trans. Red) : Toys & Games
How Many Combinations Are Possible Using 6 LEGO Bricks? | Mental Floss
Amazon.com: LEGO Parts and Pieces: Blue (Bright Blue) 2x4 Brick x20 : Toys & Games