They are importantant because they are a part of their culture.
This is a major step for them, because this shows that they have a sense of time in their lives.
Silk is expensive, in the old dynastys wearing silk shows that you are wealthy.
The chinese empire is a major in mathamatics. This is one of their major steps into developing into an advanced civilizaton.
http://ts4.mm.bing.net/images/thumbnail.aspx?q=1353664505991&id=9712a6afd239ed0ef215b7adbb4a3405&url=http%3a%2f%2fasn.am%2fcdp%2fimages%2fwheelbarrow-04.jpg The wheelbarrel allowed jobs that require labor to be done quicker and easier.
It was a cultural gift, anyone with one back during the dynastys showed that their family was weathly.
http://ts3.mm.bing.net/images/thumbnail.aspx?q=1336355271782&id=84d184350f9b82416139406d19e86dab&url=http%3a%2f%2fgoldcoinsvalues.org%2fmedia%2fimages%2fi%2f31jAhvIwstL._SL160_.jpg Being able to cast iron allows a civilization to do many things that they couldnt do before,make better tools,metal armor, and cooking utensils.
http://ts1.mm.bing.net/images/thumbnail.aspx?q=1344043812976&id=39693f6dad1c7e1c709ba917a705975a&url=http%3a%2f%2fwww.ghkuhlmann.de%2fkureng%2fImage10.jpg The horse collar was a way to use horses as a labor force, because of it the farmers could have horses plow fields or pull carts.
http://ts3.mm.bing.net/images/thumbnail.aspx?q=1335157919302&id=09d6418dc7df08a5f28e05391c37daa4&url=http%3a%2f%2farts.cultural-china.com%2fchinaWH%2fupload%2fupfiles_s%2f2010-01%2f21%2fchinese_kites_almost_everything_can_flyb3c7d1086f8c5f1b3740.jpg The kite was often used for celebrations, but it was also use for entertainment
Allowed the explorers to go further than they ever had before and not get lost.
One of the World Wonders, it was built to prevent attacks from their neighbors. it took along time to build ,but not like the myth says you cannot see it from the moon!
When paper was invented it made writing easier, they didnt have to carry stone tablets and they didnt need to let it bake after writing.
The chinese abacus was a way to help them counting each row represented a numer on diget greater than the previous.
http://ts1.mm.bing.net/images/thumbnail.aspx?q=1417735643972&id=e4b4d44d2ce1766a12dd6f425bb25e3c&url=http%3a%2f%2fwww.thenibble.com%2fimages%2f200-tealeaf.jpg Tea was a luxury drink having tea showed that your family is wealthy.
http://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Chinese_rocket.gif/220px-Chinese_rocket.gif The chinese used gunpowder to make fireworks and also to make the worlds firsts rockets.