Tangram is an ancient Chinese traditional intelligence toy, as the name suggests, is composed of seven boards. The seven boards can be combined into many shapes (more than 1600 kinds), such as triangles, parallelograms, irregular polygons. Players can also put them into various characters, images, animals, bridges, houses, towers, etc., as well as some Chinese and English letters.

One of the most popular puzzles of the 19th century was the tangram. The popularity of Tangram is probably due to its simple structure, simple operation and easy to understand. You can make your own design with a jigsaw puzzle at will, but if you want to make a specific design with a jigsaw puzzle, you will encounter a real challenge. That’s the fun of tangram.

Source: @creatura.anningan

Vinyl record is the dominant music format in the 20th century. From your 78 year old grandmother to your 45 year old celibate, because the sound quality of black glue is closest to the original sound without distortion, it feels more fidelity and perfectly covers people of all ages. Black glue, also known as LP, long play, is a stereo black Celluloid texture compact disc.

Since 1948, 33 and 1 / 3 of the records have been released. After several years of development, the single-sided recording time is nearly 22 minutes, which is much longer than before, so it is called long playing. In contrast, with the original state of science and technology, there was the so-called “SP”, that is, standard playing, which was 78 revolutions per minute. Now the popular records are almost all 33 turns, so the vinyl records are directly called “LP”.

Source: @0chicken.tattoo

My initial understanding of headphones was that they appeared as a supporting role, but now I find that many times headphones have saved my loneliness and embarrassment. Does headphones have special use and significance for everyone’s life?

I like to listen to music when I do housework and watch movies when I exercise. I like quiet very much. I bought the top floor of the East Building specially. But the new resident downstairs still practices piano after 10 p.m. and sometimes the couple quarrel and throw things in the middle of the night. One locks the other door, and at one or two in the middle of the night, one stubbornly knocks on the door, and the other never opens. I can’t help it. I bought a headset. It’s a little expensive. At least it’s worth giving me a quiet world.

When I put on the earphone, I feel like I jumped out of the reality, especially the noise reduction earphone. I live in my own world completely. Emptiness, meditation, thinking and observation are all independent and private spaces after wearing earphones. Most selfish people want to stay out of the business.

Source: @andrii_rybchenko

Diving means changing, changing yourself, character or life. Experience underwater exploration, feel the sea water cold and warm, try to make yourself more perfect, and then use a more brilliant smile to welcome life, which is perhaps the reason more and more people like diving!

The original purpose of diving is to carry out underwater exploration, salvage, repair and underwater engineering operations and enter the activities below the water surface without carrying professional tools. After diving gradually developed into a recreational sport which takes underwater activities as the main content, thus achieving the purpose of physical exercise and leisure and entertainment, which is popular among the public.

Source: @333rdstreet

Magnetic tape is a kind of ribbon material with magnetic layer used to record sound, image, digital or other signals. It is the most productive and widely used magnetic recording material. It is usually made by coating a layer of granular magnetic material on the base of plastic film (support) or evaporating a layer of magnetic oxide or alloy film. Paper and celluloid were used as tape base. Now polyester film with high strength, good stability and not easy to deform is mainly used.

On March 11, 2021, Dutch engineer Ludwig odens, who invented cassette tape, died in the Netherlands at the age of 94, according to Dutch news portal Dutch News quoted by several foreign media.

Source: @9th_circle