close all, clear all;
%wavy lines illusion
patt = zeros(36,72,3);
patt(1:2,:,1)=1;
patt(3:36,33:35,1)=1;
patt(3:36,1:32,:)=1;
patt(3:36,71:72,1)=1;
rowpatt = [patt patt patt patt patt patt patt patt];
rowpatt4 = [rowpatt(:,24:535,:); rowpatt(:,16:527,:); rowpatt(:,8:519,:); rowpatt(:,16:527,:)];
wavy_image = [rowpatt4; rowpatt4; rowpatt4];
imshow(wavy_image)
figure, imshow(rowpatt)