Compare these two documents:
http:/www.dreamsongs.comExtravagaria/Mendeleev100.gif
http:/www.dreamsongs.comExtravagaria/Blake100.gifOn the left is one of the early drafts of Mendeleev's periodic tables. At the bottom you can see a list of elements in order of ascending atomic weights. You can see crossouts as he tried to place three particular elements.
On the right is the final draft of William Blake's "The Tyger." Again you see crossouts, and in particular the phrase "dread grasp" moving from place to place.
One might suppose that a scientists is a discoverer and a poet a creator. But these works-in-progress hint that both scientists and poets are explorers as well as inventors. The scientist Mendeleev had to play around with the periodic table-a human creation which looks at elements through a particular lens-to get it right, and the poet Blake had to do the same thing with his poem. Both scientists and poets would say that the material is directing them, that they are mere explorers in their own domains.