Progress bars and throbbers are, in theory, tools that let your user know that a process is working. It's important to provide feedback when your program needs to do some long-running task.

Hegel inherited a rather old application, written in early versions of VB.Net. When you kicked off a long running process, it would update the status bar with a little animation, cycling from ".", to "..", to "...".

    Private Sub StatusRunningText(ByVal Str As String)
        If ServRun = True Then
            Select Case Me.Tim.Now.Second
                Case 0, 3, 6, 9, 12, 16, 19, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 59
                    Me.StatusBarPanel1.Text = Str + "."
                Case 1, 4, 7, 10, 13, 17, 20, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58
                    Me.StatusBarPanel1.Text = Str + ".."
                Case Else
                    Me.StatusBarPanel1.Text = Str + "..."
            End Select
        End If
    End Sub

Now, you or I might have been tempted to use modulus here. Second % 3 + 1 is the exact number of periods this outputs. But how cryptic is that? It involves math. This developer has lovingly handcrafted their animation, specifying what should be displayed on each and every frame.

Modular arithmetic is math, but this code, this is art.

Bad art, but still, art.