One of the forwards I received from couple of WhatsApp groups as follows:
This is one of the wonders of Indian Architectural & Crafting Technology.
This is a brass handicraft of Bhagwan Shri Krishna sitting on his father Vasudev’s lap, made in ancient India. There is a hole in the bottom of the cup. Water does not flow out of the cup till it touches the feet of Shri Krishna.
The moment the water touches the Lord’s Feet, water starts flowing out & drains out completely from the bowl.
Engineers are still baffled at how it is made in those days without any proper engineering techniques or equipment.
If above is the explanation, then this is credited to Pythagoras ( c. 570 – c. 495 BC) See Pythogoras cup