From the #Bitcoin group on Telegram:

Secp256k1 is the name of the elliptic curve used by Bitcoin to implement its public key cryptography.

All points on this curve are valid Bitcoin public keys.

Here it is visualized:

https://cdn.nostr.build/p/3vLY.mp4

From me:

Every public key

Is on this line;

One is Satoshi's,

And one is mine.