How many pieces does The Evolution of STEM have?

Set 21355 contains 879 pieces and comes with 3 minifigures.

Which LEGO® range is the set from?

It belongs to LEGO® Ideas, a range that turns fan proposals into official sets.

LEGO Ideas and CUUSOO

The Evolution of STEM

The Evolution of STEM depicts several historical milestones from science, technology, engineering and mathematics as small display models on a shared base. With 879 pieces and three minifigures, it is one of the most narrative-driven LEGO® Ideas sets around.

Set number: 21355
Year: 2025
Pieces: 879
Minifigures: 3
Theme: LEGO Ideas and CUUSOO
Different parts: 365

What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 365

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Spare parts (81)

These extra parts come with the set in case one gets lost.

Minifigures 3

Isaac Newton fig-0160404 pieces × 1
Marie Skłodowska-Curie fig-0160414 pieces × 1
George Washington Carver fig-0160424 pieces × 1

Alternative models

Fan models by Rebrickable users that you can build (mostly) from this set’s parts. Instructions are available from the designers.

(21355) Sub Sandwich 12 pieces by Just Build It

View the idea at Rebrickable ↗

What can I build with it?

Description

Milestones from the history of science

Rather than a single theme, the set depicts several historical objects and inventions representing the development of science, technology, engineering and mathematics, arranged on a shared base like a small exhibition. This concept is typical of narrative LEGO® Ideas sets, which break complex subjects into several small, understandable build sections. For educational settings or science-minded collectors, it's an unusual but fitting build idea, one that LEGO® Ideas' fan-proposal format makes possible in the first place.

365 unique parts for many small objects

With 365 unique parts among 879 pieces overall, the set ranks among the most part-rich models in its size class, explained by its many small, varied build sections. The parts list on this page shows a wide range of specialised parts needed for the different historical objects. That variety also makes the set interesting to collectors after pieces for their own diorama projects, and close inspection reveals plenty of loving detail across the individual objects.

A restrained palette with red accents

Black and tan form the base for the display case and plinth, joined by reddish brown for historical materials such as wood or metal, while red picks out deliberate accents on individual objects. This restrained colour choice underlines the set's museum-like, scientific character and stands apart from the brighter colours of classic play sets. For collectors building out a LEGO Ideas and CUUSOO collection, this model is a worthwhile addition. A closer look also reveals smaller details that only stand out on a second pass.

Three minifigures for scale and scenes

With three minifigures included, individual objects can be set in scale against a human figure, adding to the set's storytelling. That makes it especially interesting to collectors who value science and education as a building theme. The parts list is also useful for matching colours in other display case or exhibition projects, turning the case into a small timeline of major scientific developments. In the end, this LEGO Ideas and CUUSOO set balances build experience and finished result well.

FAQ

How many pieces does The Evolution of STEM have?: Set 21355 contains 879 pieces and comes with 3 minifigures.
What does the set show?: It shows several historical milestones from science, technology, engineering and mathematics as small display models.
Which LEGO® range is the set from?: It belongs to LEGO® Ideas, a range that turns fan proposals into official sets.