LEGO Set 21355 The Evolution of STEM: Pieces, Year, Figures

Specifications

Set number	21355
Release year	2025
Piece count	879
Minifigures	3
Theme	LEGO Ideas and CUUSOO
Building instructions	Download the instructions on lego.com

Where to buy set 21355

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LEGO Ideas 21355, The Evolution of STEM, is a 2025 set focused on the history of science, technology, engineering and mathematics. It belongs to the LEGO Ideas and CUUSOO theme and contains 879 pieces.

This model sits within LEGO Ideas and CUUSOO, the theme where selected community concepts become official sets. The Evolution of STEM is not tied to a fictional licence. Its subject is educational and historical, with the build framed around scientific progress and people associated with major areas of knowledge.

Those figures define the focus of the model and give it a clear STEM context.

It is suited to LEGO Ideas collectors, builders interested in the history of science and anyone looking for a display piece with an educational angle. Within LEGO Ideas and CUUSOO, it stands apart from entertainment licences by using real historical subjects and a documentary style rather than a fantasy or media based setting.

Inventory of set 21355

The inventory of set 21355 lists 879 pieces, spare parts excluded: 377 different lots (one shape in one color) for 247 part shapes. The box also contains 84 spare parts, for small elements that are easy to lose.

Colors of set 21355

Main color: black, making up 19% of the parts, followed by tan (17%) and reddish brown (6.5%).

Color	Parts	Share
Black	168	19%
Tan	152	17%
Reddish Brown	57	6.5%
White	56	6.4%
Red	55	6.3%
Dark Red	52	5.9%
Light Bluish Gray	42	4.8%
Bright Green	38	4.3%
Medium Nougat	37	4.2%
Blue	28	3.2%
Other colors (34)	193	22%

Part types

Type	Parts	Share
Plates	130	15%
Plates Special	108	12%
Tiles	72	8.2%
Tiles Special	57	6.5%
Bricks Curved	50	5.7%
Tiles Round and Curved	47	5.3%

Most common parts in set 21355

Part	Color	Quantity
Technic Beam 1 x 2 with Axle on Side 7244	Red	22
Technic Pin Connector Round 1L [Beam] 18654	Red	20
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot 42924	Blue	20
Brick Curved 2 x 2 x 2/3 15068	Tan	15
Plant, Plate 1 x 1 Round with 3 Leaves 32607	Bright Green	13
Tile Special 1 x 2 Grille with Bottom Groove 2412b	Light Bluish Gray	12
Brick Curved 1 x 2 x 1 2/3 with 1 Cutout 5907	Tan	12
Technic Axle 2 Notched 32062	Black	11
Plate 1 x 5 78329	Tan	10
Plate Special Round 1 x 1 with Hollow Stud and Underside Clip 5264	Black	9

223 of the 247 part shapes in this set have their own page on Setopedia, with their colors, element numbers and the other sets that use them. See all LEGO parts

Exclusive parts in set 21355

6 part shapes in set 21355 appear in no other set in the catalog, most often printed elements, stickers or molds specific to the model. If one gets lost, you will need to look for it individually, for example on BrickLink, rather than in another set. Counting colors, 8 lots in the set are not found in any other set.

Part	Color
Sticker Sheet for Set 21355-1 10111467
Torso, Jacket with Single Button Secured, Pink Flower, White Shirt with Sand Blue Lines print, Reddish Brown Arms, Umber Brown Hands 973c19h80pr0001	Reddish Brown
Torso Tunic, Blue and Dark Azure Shirt, White Scarf print, Sand Green Arms, Light Nougat Hands 973c25h02pr0003	Sand Green
Minifig Head George Washington Carver, Thick Dark Bluish Grey Eyebrows, Moustaches, Black Wrinkles 28621pr9723	Umber Brown
Torso, Dress, Dark Bluish grey Laces print, Black Arms, Light Nougat Hands 973c03h02pr0013	Black
Tile 1 x 1 with Green Pixelated DNA Molecule print 3070bpr9898	Bright Green

No similarly sized set supplies more than a quarter of its parts: set 21355 relies on a little-shared assortment.

Size of set 21355 within its line

With 879 pieces, set 21355 ranks #54 out of 94 LEGO Ideas and CUUSOO sets in our database, which have an average of 1,279 parts. Among the 625 sets released in 2025, it ranks #112.

Included minifigures

Isaac NewtonQuantity : 1
Marie Skłodowska-CurieQuantity : 1
George Washington CarverQuantity : 1

Frequently asked questions

How many pieces does LEGO set 21355 The Evolution of STEM have?

LEGO set 21355 The Evolution of STEM has 879 pieces. It was released in 2025 as part of the LEGO Ideas and CUUSOO theme.

What year was LEGO set 21355 released?

Set 21355 The Evolution of STEM was released in 2025 and belongs to the LEGO Ideas and CUUSOO theme.

Which minifigures are included in set 21355?

Number of minifigures in LEGO set 21355 The Evolution of STEM: 3. Their names and quantities are listed in the “Included minifigures” section.

Where can I find the building instructions for set 21355?

The instructions for LEGO set 21355 The Evolution of STEM can be downloaded free as a PDF from the official lego.com website, under “Building Instructions”, by entering the number 21355.

What is the main color of LEGO set 21355?

Black, with 168 out of 879 pieces, or 19%. Next come tan (17%) and reddish brown (6.5%).

How many different parts does set 21355 contain?

Set 21355 has 377 different lots (one shape in one color), covering 247 part shapes. Most common part: Technic Beam 1 x 2 with Axle on Side in red, with 22 copies.

Does LEGO set 21355 contain any exclusive parts?

Yes: 6 part shapes exist in no other set, for example: Sticker Sheet for Set 21355-1.

Which historical figures are included in LEGO Ideas 21355 The Evolution of STEM?

The set includes Isaac Newton, Marie Skłodowska-Curie and George Washington Carver.

Is The Evolution of STEM based on a film or television licence?

No, it is listed under LEGO Ideas and CUUSOO and focuses on the historical development of STEM.