รูปสี่เหลี่ยมจัตุรัสในรูกลม

Video screenshots

• 00:03
• 00:18
• 00:33
• 00:48
• 01:03
• 01:19
• 01:34
• 01:49
• 02:04
• 02:19

I found it quite enjoyable to put a square leg in a round hole, not sure why they recommend against it.