Since the debut of the first "big brother" wireless phone, the mobile phone has gone through 40 years of development. From the initial large "bricks" to today's super thin bodies, mobile phones have been self-improving while also changing people's lives.In order to display the 40-year evolution of the mobile phone industry, British artist Kyle Bean specially designed a set of Matryoshka doll-inspired mobile phone models. These hollow-designed phone models can be nested one inside another. From this, we can see that phones are becoming increasingly miniaturized and more beautiful.Fun fact: In April 1973, Motorola developed the world's first mobile phone, the DynaTAC. This "big brother" product weighed in at 1.15 kg and measured 25.4 cm in length. It had 20 huge buttons and a long rubber antenna. Each call could only last for 30 minutes, yet it took 10 hours to fully charge.