Eye Test

[OH Osthaus]

Assuming overlapping lines count

18

[ArtS]

I at first thought 10 but I believe 14 is correct.

Carefully measure the squares on the screen and you will find that there are 2 fundamental dimensions; the sides od the corner squares and ther sides of the inner squares. Print out the picture and label the two lengths as x and y. List the sides of all the possible squares and the ones that are equal are true.
i.e. x+2y=x+2y
2y=2y
etc

I am presuming we are dealing with only the printed lines.