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Do you want to delete “Through the tunnel” **permanently**? You will not be able to undo this action.

circles = [] def getColorForWidth(width): decColor = (150 - width) // 10 hexColor = hex(decColor)[2:] colorString = '#' + hexColor + hexColor + hexColor return colorString def createCircle(x): return Circle(width = 0, height = 0, color = getColorForWidth(0), x = x) def advanceSingleCircle(circle): currentWidth = circle.width newWidth = int(currentWidth + 10) circle.width = newWidth circle.height = newWidth circle.color = getColorForWidth(newWidth) def advanceCircles(): for circle in circles: advanceSingleCircle(circle) if len(circles) > 20: circles.pop(0) # ideally we should destroy the popped circle def animationIteration(i): with animation(duration = 0.15): advanceCircles() circles.append(createCircle(i)) circles.append(createCircle(30)) for i in range(30): advanceCircles() circles.append(createCircle(30)) for i in range(30, 70, 2): animationIteration(i) for i in range(15): animationIteration(70) for i in range(70, 30, -2): animationIteration(i) for i in range(15): animationIteration(30)