Lots of different notes present. Perfect 5th, major 2nd, major 3rd, major 7th are all found in the harmonic series. In addition there's some beautiful non-piano intervals, notably the 7th harmonic (slightly flat minor 7th) and the 11th harmonic (flat tri-tone)
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90 second video demonstration: https://www.youtube.com/watch?v=VnC8I3d2MXQ
Lots of different notes present. Perfect 5th, major 2nd, major 3rd, major 7th are all found in the harmonic series. In addition there's some beautiful non-piano intervals, notably the 7th harmonic (slightly flat minor 7th) and the 11th harmonic (flat tri-tone)
Strictly speaking they're all non-piano intervals, just some are more non-piano than others. (Or you can retune your piano …)