How did ancient door locks work?

Super comfortable and extremely stress-relieving

qiqutu

47.3K Views

Cardboard track ball, rotating elevator successfully tested

xiaozhukuwan

12.2K Views

Wooden track ball, tested successfully

xiaozhukuwan

14.0K Views

A little useful trick

yaki1

6.5K Views

unexpected results

xiaozhukuwan

1.3K Views

The Adventure of Rolling Balls in Life

xiaozhukuwan

20 Views

200 wooden track balls and large wave boards in multiple colors were tested successfully

xiaozhukuwan

160.6K Views

How could a six-piece T-shaped puzzle fit in?

xiaozhukuwan

21.1K Views

Topology puzzles from childhood

xiaozhukuwan

3.5K Views

Do you know how to take out the Rubik's Cube from the bottle?

xiaozhukuwan

661 Views

Hand-made four-rotor engine! I built a retro motorcycle for my daughter

iris_case

36 Views

Topology in life (4)

xiaozhukuwan

3.0K Views

Pajama heroes build an ice cream car

__aowanzidonghua

52.3K Views

The most exciting job in the world

qilixiangwenhua

13.0K Views

Spend 5,000 yuan to buy a piece of steel and make a simple kitchen knife. Is it worth it to see the

Xiangyuanxiaozu

616 Views

How do you think it can be taken out?

xiaozhukuwan

3.6K Views

Just make a simple spinning top from childhood, how many people still remember its name?

xiaozhukuwan

5 Views

The gadgets of our ancestors are passed down to this day, and the inheritance of craftsmanship must

Amuyeye

18.9K Views

It's cool to watch

jieyayishuguan

53 Views

How powerful is a load-bearing bridge built with a few small wooden bars?

xiaozhukuwan

41 Views