[lang_zh]順時針? 逆時針?[/lang_zh][lang_en]clockwise or counterclockwise[/lang_en]

[lang_zh]
這是一個有趣的 flash: http://pya.cc/pyaimg/pimg.php?imgid=12882

她是順時針轉還是逆時針轉? 我第一眼看到的是順時針，後來知道要訣之後，就能切換了。
[/lang_zh]

[lang_en]
This is an interesting flash: http://pya.cc/pyaimg/pimg.php?imgid=12882

Do she rotate in clockwise or counterclockwise? It's clockwise to me at the first sight. After getting the point, I can switch between both modes.
[/lang_en]