If you want to see what these 21-bit still lifes look like, their glider construction recipes are all stored online, on Catagolue (no, that's not a misspelling)

If you want to see what these 21-bit still lifes look like, their glider construction recipes are all stored online, on Catagolue (no, that's not a misspelling): https://catagolue.appspot.com/census/b3s23/synthesis-costs/xs21 https://catagolue.appspot.com/census/b3s23/synthesis-costs/x...