1. While Francis had been gazing into the unseeable distance, the wall had extended several metres across the clearing.

2. The unseeable is very often ignored.

3. When the world's greatest living painter can't do justice to his theme, can only render it as blurred and almost unseeable, you get a sense of its enormity.

4. Nobody can conceive or imagine all the wonders there are unseen and unseeable in the world.

5. Nobody can conceive of imagine all the wonders there are unseen and unseeable in the world.