Why is My LEGO Tower Wobbly? (Triangles!)

You stack LEGO bricks straight up. 10 bricks… 20 bricks… CRASH. Why did it fall? Because Squares are Wobbly.

The Square Problem

Imagine a square made of sticks. If you push the corner, it squishes into a diamond shape. It isn’t strong. Most LEGO towers are just stacks of squares. They have “weak ankles.”

The Triangle Solution

Now imagine a Triangle. If you push on the top of a pyramid, does it squish? No. Triangles are the strongest shape in the universe.

• The Cross-Brace: If you take your wobbly square toggle and put a diagonal stick across it (corner to corner), you have turned it into two triangles.
• Now, it cannot wobble!

Building Better FLL Robots

In FIRST LEGO League, your robot needs to be tough. It will bump into walls and missions.

• Don’t just use pins to connect two beams.
• Add a diagonal “Cross-Brace” beam.
• Build triangles, not squares. Your robot will be solid as a rock!