Never boring

Long ago when even scientists were expected to write essays the following essay title was set in the Part II of the Natural Science Tripos at Cambridge. 'Now as I beheld the living creatures, behold one wheel upon the earth by the living creature, with his four faces. The appearance of the wheels and their work was like unto the colour of a beryl: and they four had one likeness: and their appearance and their work was as it were a wheel in the middle of a wheel'. Discuss.

John Marsh