The Evolution of STEM (21355-1) is a LEGO Ideas and CUUSOO LEGO set released in 2025 with 879 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing LEGO Ideas and CUUSOO sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 3 minifigures and 365 unique part types.
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Building instructions
Official LEGO instructions — read on BrickID
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Minifigures in The Evolution of STEM
Parts in this set
365 parts · page 1 of 8 · updating…
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Animal / Creature Body Part, Claw with Clip3171 · ×2 · Black -
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small53451 · ×4 · Black -
Animal Body Part, Horn Stacked 45 deg. with Axle Connectors2142 · ×1 · Reddish Brown -
![Bar 1 x 3 [Clip / Anti-Stud]](https://cdn.rebrickable.com/media/parts/elements/4141580.jpg)
Bar 1 x 3 [Clip / Anti-Stud]4735 · ×2 · Black -
Bar 1L / Stem with 3 Sprouts/Prongs68211 · ×1 · Bright Green -
Bar 1L / Stem with 3 Sprouts/Prongs68211 · ×1 · Reddish Brown -
![Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]](https://cdn.rebrickable.com/media/parts/elements/6439039.jpg)
Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]3484 · ×1 · Black -
![Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]](https://cdn.rebrickable.com/media/parts/elements/6439053.jpg)
Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]3484 · ×3 · Reddish Brown -
Bar 2L with Stop in Center78258 · ×1 · Reddish Brown -
Bar 2L with Towball22484 · ×3 · Orange -
Bar 2L with Towball22484 · ×3 · Dark Azure -
Bar 3L87994 · ×1 · Dark Green -
Bar 6L with Stop Ring63965 · ×1 · Black -
Bar 6L with Stop Ring63965 · ×1 · Pearl Gold -
Bar Curved with Axle End and 1 x 1 Round Plate4042 · ×3 · Trans-Clear -
Bar Holder with Clip11090 · ×2 · Flat Silver -
Bar Holder with Clip and 90° Angle (Mechanical Leg)72869 · ×4 · Black -
Bar, Angled with 1 x 1 Round Plate / Stud on End65578 · ×1 · Light Bluish Gray -
Bar, Angled with 1 x 1 Round Plate / Stud on End65578 · ×1 · Green -
Bar, Angled with 1 x 1 Round Plate / Stud on End65578 · ×2 · Trans-Clear -
Bar, Ring 7L Diameter, with 2 Axle Connectors79851 · ×1 · Black -
Bracket 1 x 1 - 1 x 136841 · ×1 · White -
Bracket 1 x 1 - 1 x 1 Inverted36840 · ×1 · White -
Bracket 1 x 1 - 1 x 2 Inverted73825 · ×1 · Dark Bluish Gray -
Bracket 1 x 1 - 1 x 2 Inverted73825 · ×2 · Reddish Brown -
Bracket 1 x 2 - 1 x 299781 · ×1 · Black -
Bracket 1 x 2 - 1 x 299781 · ×1 · Dark Turquoise -
Bracket 1 x 2 - 1 x 2 Inverted99780 · ×6 · Reddish Brown -
Bracket 1 x 2 - 1 x 2 Inverted99780 · ×2 · Dark Blue -
Bracket 1 x 2 - 1 x 2 Inverted99780 · ×2 · Dark Orange -
Bracket 1 x 2 with 1 x 2 Vertical Studs4585 · ×1 · Black -
Bracket 2 x 2 with 1 x 2 Vertical Studs41682 · ×1 · Black -
Bracket 2 x 2 with 1 x 2 Vertical Studs41682 · ×1 · Tan -
Bracket 3 x 2 x 1 1/3 with Bottom Stud Holder73562 · ×1 · Tan -
Brick 1 x 13005 · ×2 · Dark Turquoise -
Brick 1 x 13005 · ×2 · Reddish Brown -
Brick 1 x 23004 · ×2 · White -
Brick 1 x 43010 · ×8 · Tan -
Brick 1 x 63009 · ×2 · Dark Bluish Gray -
Brick 1 x 83008 · ×4 · Tan -
Brick 2 x 23003 · ×4 · White -
Brick 2 x 2 Corner2357 · ×4 · Tan -
Brick 2 x 33002 · ×1 · Dark Bluish Gray -
Brick 2 x 43001 · ×1 · White -
Brick 2 x 62456 · ×2 · Tan -
Brick 2 x 62456 · ×2 · Medium Nougat -
Brick and Axle Separator v2.096874 · ×1 · Orange -
Brick Arch 1 x 34490 · ×1 · Dark Bluish Gray