Let’s first take a look at this photo. Can you recognize it?

How about this one? Yes, it is also a London bridge.

Compared to the real London Bridge, we only need a limited set of LEGO pieces to build it.

And all the famous land marks in the world can be reconstructed using these limited types of pieces. From the perspective of dimensionality reduction, LEGO does a great job!

This is a list of all the pieces in a LEGO toy set. Instead of rushing to the next page, take a guess—what will we get once it’s fully assembled?

Yes, just as you guessed—it’s a helicopter! This was my eldest son’s first Creator set when he was not even three years old. Alright, I must admit, I was also quite eager to try out the LEGO set myself.

Let’s take a closer look at this LEGO “data.” I bet you’ve already noticed some extracted features. It’s quite obvious that these pieces can be perfectly assembled into a propeller.