accordion

Reference of finished painting

Step one: draw two rectangles.

Step 2: Draw two long polylines in the middle.

Step 3: Then draw a rectangular square on the left, and draw some horizontal lines in the middle to serve as keys.

Step 4: Then draw some smaller black squares in the middle of the keys, paying attention to their position.

Step 5: In the middle of the polyline, draw vertical lines slightly spaced apart.

Step 6: In the middle, add some small horizontal lines to enrich the picture.

Step 7: Finally, apply a nice color and the accordion is ready.