I haven't been uploading things lately to openclipart since I'm trying to sell my art, but this is a very special one that I think should be shared with the world. There are some amazing illusions that can be done and this is one of them.
神聖的雙五邊形
circle、double、geometric、geometry、pentagon、polygon、sacred
圈、雙、幾何、幾何、五角大樓、多邊形、神聖
資料來源：openclipart ( https://openclipart.org/ )