阿拉伯數字怎樣來的?

哈!這個有趣,沒有想到阿拉伯數字的起源是來自幾何,當然就跟建築人有很深的關係:
<div><a href="http://www.slideshare.net/pedro.hsieh/i-l-o-v-e-y-o-u-d-a-r-l-i-n-g?type=powerpoint" title="Arabic Numbers">Arabic Numbers</a><object width="425" height="355"><param name="movie" value="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=arabicnumerals-090403092908-phpapp02&stripped_title=i-l-o-v-e-y-o-u-d-a-r-l-i-n-g"><param name="allowFullScreen" value="true"><param name="allowScriptAccess" value="always"><embed src="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=arabicnumerals-090403092908-phpapp02&stripped_title=i-l-o-v-e-y-o-u-d-a-r-l-i-n-g" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object>
<div><a href="http://www.slideshare.net/pedro.hsieh/i-l-o-v-e-y-o-u-d-a-r-l-i-n-g?type=powerpoint" title="Arabic Numbers">Arabic Numbers</a><object width="425" height="355"><param name="movie" value="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=arabicnumerals-090403092908-phpapp02&stripped_title=i-l-o-v-e-y-o-u-d-a-r-l-i-n-g"><param name="allowFullScreen" value="true"><param name="allowScriptAccess" value="always"><embed src="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=arabicnumerals-090403092908-phpapp02&stripped_title=i-l-o-v-e-y-o-u-d-a-r-l-i-n-g" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object>