I procured me a Triangular glass-Prisme, to try therewith the celebrated Phenomena of Colours. And in order thereto having darkened my chamber and made a small hole in my window-shuts, to let in a convenient quantity of the Suns light…but I surprised to see them in an oblong form; which, according to the received laws of Refraction, I expected should have been circular.
Well, Isaac Newton obviously had better functioning shutters than my bedroom blackout blinds. Most summer mornings (which at this latitude last much of the night…) I receive — without choice — lessons in physics 101. Here are some iPhone shots from this morning. The quote says a lot about science: note the terms, convenient quantity, surprised and expected.