根据美国专利局的文档描述（"Glass appearance window frame colorization"和"Dynamic reflective highlighting of a glass appearance window frame"），Aero的投影会随着当前窗口位置的不同而变化，同时或者替代的效果可能也会随一天时间的变化而变化。原文如下：
As described above, a reflective highlight of a glass appearance of an application window frame may be configured to change during a move and/or resize operation based on a set of rules that describe a reflective highlight image's placement relative to the current position of the application window within a desktop space. Concurrently or alternatively, a reflective highlight may be configured to change in response to a time of day event.
为了清楚解释如何发生，请看下面的图表：
如上图所示，707区域被划分为一天的24个小时，705是虚线所包围的区域。也就是说，横坐标作为时间轴，窗口的投影区域会随时时间的推移，投影方向也会发生变化。
可惜的是专利局没有使用高质量的彩色扫描仪，否则这个效果看起来不知道有多酷。（Via）
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