Head-to-head
LEGO Ideas Dinosaur Fossils vs LEGO Ideas Grand Piano
Both built. Both reviewed. Here's how they actually compare on the things that matter.
Set #21320
LEGO Ideas Dinosaur Fossils
Three museum skeletons on wood-look display bases. The closest LEGO has come to letting you walk into a natural history museum.
Set #21323
LEGO Ideas Grand Piano
The keys press. The hammers strike. The app plays music. The most mechanically ambitious LEGO Ideas set ever shipped.
By the numbers
The spec sheet.
| Metric | LEGO Ideas Dinosaur Fossils | LEGO Ideas Grand Piano |
|---|---|---|
| Rating | 4/5 | 5/5WINS |
| Pieces | 910 | 3,662WINS |
| MSRP | $59.99WINS | $379.99 |
| Price per piece | $0.07WINS | $0.10 |
| Verdict | Recommended | Must buy |
| Best for | Natural-history fans, kid-room display builders, and LEGO Ideas collectors hunting retired sets. | Musicians, kinetic-LEGO appreciators, and serious LEGO Ideas collectors with substantial display space and budget. |
Pros & cons
What I actually noticed.
LEGO Ideas Dinosaur Fossils
Pros
- Three complete dinosaur skeletons (T. rex, Triceratops, Pteranodon)
- Each on its own wood-look display base — modular and rearrangeable
- Retired since 2021 — secondary market up 60%+ over MSRP
- Skeleton anatomy is surprisingly accurate for a LEGO set
- Best value retired LEGO Ideas set per piece
Cons
- Skeletons are static — no articulation or movable poses
- Aftermarket pricing has crossed into 'wait for a deal' territory
- Display bases are unforgiving if you bump them — skeletons separate easily
LEGO Ideas Grand Piano
Pros
- Working keys with motorized hammer mechanism
- Bluetooth app integration for actual music playback
- Lifting top panel reveals the strings and hammer assembly
- Working pedals (sustain and una corda)
- Compact bench and music-rest accessories
Cons
- Powered Up motor sold separately (adds $80+ for full functionality)
- App-only music playback — no standalone speaker
- $380 commitment — among the highest LEGO Ideas MSRPs
Made up your mind?
Pick a retailer.
Comparison generated from our individual reviews. Pros, cons, and ratings come from full hands-on builds — see each review for the complete take.