You’ll need a Pokeball to catching a Pokemon. How about Cats? It’s even easier! Using a “square”, then the cats will go into it with not doubts!
It’s so simple, you only need to prepare a roll of adhesive tape, and then make a square (the blue square above), then sit down and prepare your phone, and you can see that the cat enters and stays!
（From : stephseifert1 ）
The scientists mention that, the “square” can make the cat feel so safe, this is why they would love to stay inside the square.
（From : jaynehollar）
Well, it doesn’t only works for cats. Using a square, you can also keep a dog within it. Same logic, easy and cheap, just buy a roll of adhesive paper!