Blake makes quite explicit that when sense ratios change, men change. Sense ratios change when any one sense or bodily or mental function is externalized in technological form:
The Spectre is the reasoning Power in Man, & when separated
From Imagination and closing itself as in steel in a Ratio
Of the things of Memory, It thence frames Laws & Moralities
To destroy Imagination, the Divine Body, by Martrydoms & Wars.