The Da Vinci Notebooks
Light and shadow with regard to the position of the eye (141--145).Every shaded body that is larger than the pupil and that interposes between the luminous body and the eye will be seen dark.
When the eye is placed between the luminous body and the objects illuminated by it, these objects will be seen without any shadow.
84:62 : The diagram which in the original stands above line 1 is given on Plate , No 2. Then, after a blank space of about eight lines, the diagram Plate No 3 is placed in the original. There is no explanation of it beyond the one line written under it.