diff --git a/supacodeTests/BaguaWorkingIndicatorTests.swift b/supacodeTests/BaguaWorkingIndicatorTests.swift
index f8a51d5a..e221d2bd 100644
--- a/supacodeTests/BaguaWorkingIndicatorTests.swift
+++ b/supacodeTests/BaguaWorkingIndicatorTests.swift
@@ -4,50 +4,18 @@ import Testing
 @testable import supacode
 
 struct BaguaWorkingIndicatorTests {
-  @Test func perimeterTracesTheRingClockwise() {
-    #expect(
-      BaguaWorkingIndicator.perimeter.map { [$0.row, $0.col] }
-        == [[0, 0], [0, 1], [0, 2], [1, 2], [2, 2], [2, 1], [2, 0], [1, 0]]
-    )
+  @Test func framesUseFullTrigramSequence() {
+    #expect(BaguaWorkingIndicator.frames == ["☰", "☱", "☲", "☳", "☴", "☵", "☶", "☷"])
   }
 
-  @Test func centerDotStaysAtBaseOpacity() {
-    // The middle cell is never part of the pulse, regardless of phase.
-    #expect(BaguaWorkingIndicator.opacity(row: 1, col: 1, phase: 0) == BaguaWorkingIndicator.baseOpacity)
-    #expect(BaguaWorkingIndicator.opacity(row: 1, col: 1, phase: 4) == BaguaWorkingIndicator.baseOpacity)
-  }
-
-  @Test func pulseHeadIsFullyLit() {
-    // When phase aligns with a perimeter index, that dot reaches full intensity.
-    let head = BaguaWorkingIndicator.perimeter[0]
-    #expect(BaguaWorkingIndicator.opacity(row: head.row, col: head.col, phase: 0) == 1)
-  }
-
-  @Test func opacityFallsOffWithPerimeterDistance() {
-    // Neighbors of the pulse head are dimmer, and dots far away sit at base.
-    let head = BaguaWorkingIndicator.perimeter[0]
-    let neighbor = BaguaWorkingIndicator.perimeter[1]
-    let opposite = BaguaWorkingIndicator.perimeter[4]
-
-    let headOpacity = BaguaWorkingIndicator.opacity(row: head.row, col: head.col, phase: 0)
-    let neighborOpacity = BaguaWorkingIndicator.opacity(row: neighbor.row, col: neighbor.col, phase: 0)
-    let oppositeOpacity = BaguaWorkingIndicator.opacity(row: opposite.row, col: opposite.col, phase: 0)
-
-    #expect(headOpacity > neighborOpacity)
-    #expect(neighborOpacity > oppositeOpacity)
-    #expect(oppositeOpacity == BaguaWorkingIndicator.baseOpacity)
-  }
+  @Test func frameSelectionLoopsByDuration() {
+    let duration = BaguaWorkingIndicator.frameDuration
 
-  @Test func pulseWrapsAcrossTheSeam() {
-    // Distance is measured the short way around, so the last dot lights up
-    // as the pulse approaches the wrap point from index 0.
-    let last = BaguaWorkingIndicator.perimeter.count - 1
-    let lastDot = BaguaWorkingIndicator.perimeter[last]
-    let opacityNearSeam = BaguaWorkingIndicator.opacity(
-      row: lastDot.row,
-      col: lastDot.col,
-      phase: 0
-    )
-    #expect(opacityNearSeam > BaguaWorkingIndicator.baseOpacity)
+    #expect(BaguaWorkingIndicator.frame(at: Date(timeIntervalSinceReferenceDate: 0)) == "☰")
+    #expect(BaguaWorkingIndicator.frame(at: Date(timeIntervalSinceReferenceDate: duration)) == "☱")
+    #expect(BaguaWorkingIndicator.frame(at: Date(timeIntervalSinceReferenceDate: duration * 7)) == "☷")
+    #expect(BaguaWorkingIndicator.frame(at: Date(timeIntervalSinceReferenceDate: duration * 8)) == "☶")
+    #expect(BaguaWorkingIndicator.frame(at: Date(timeIntervalSinceReferenceDate: duration * 13)) == "☱")
+    #expect(BaguaWorkingIndicator.frame(at: Date(timeIntervalSinceReferenceDate: duration * 14)) == "☰")
   }
 }