Granted, that one starts out as non-artificial as it's possible to be. But compare https://hanziyuan.net/#%E7%94%B2 , where the original character is 十 and it develops through 田 and various intermediate forms into the modern form 甲. You don't get more abstract than 甲.
Your mileage may vary.
https://hanziyuan.net/#%E8%99%8E
Granted, that one starts out as non-artificial as it's possible to be. But compare https://hanziyuan.net/#%E7%94%B2 , where the original character is 十 and it develops through 田 and various intermediate forms into the modern form 甲. You don't get more abstract than 甲.