There are guitars with weirdly shaped frets, if you really want to approach true temperament. https://qph.fs.quoracdn.net/main-qimg-659a2269b3cf8608d61d56844fc

There are guitars with weirdly shaped frets, if you really want to approach true temperament. https://qph.fs.quoracdn.net/main-qimg-659a2269b3cf8608d61d56844fc64424 https://qph.fs.quoracdn.net/main-qimg-659a2269b3cf8608d61d56...