I created some digital calligraphic letter forms during my exchange. Inside my letterforms the closure principle is heavily applied here by the way i haven’t coloured in the whole “N”.
When you view the image you are aware the letter isn’t finished but also aware the letter is an “N”. This is down to the Gestalt Law of Closure.
"Closure occurs when an object is incomplete or a space is not completely enclosed. If enough of the shape is indicated, people perceive the unified whole by filling in the missing information to complete the image in their minds thus perceiving the complete picture."
(Max Wertheimer, 1923)
Also in play here is the past experience principle, everyone despite what language you speak will have seen an “n” more specifically a capital “N”. Your mind has already recorded this information, so when you see the image you know it’s taking shape of an “N” causing your mind to use the closure principle to complete it