This illusion shows 2 lines that appear bent but are
actually perfectly straight.
Step 1: Step 1
Continue to add the diagonal lines as well.
try not to go far from the middle join point.
Step 2: Filling In
Step 3: Trimming
lines always able to change to preferences, try a few ways.
Step 4: Finishing
kind through the lines a bit above the middle.
i said yellow because thats what i did but you can try different colours.