Radio is a clock that reads like a receiver rather than a watch. Sixty ticks travel steadily past a fixed band at the centre of the screen, and whatever is sitting inside that band is the current time. Nothing points at anything: the scale moves and the marker stays still, which is the opposite of how every other face here works.
Tuner is the vertical form. The ticks run as a single strip, one full screen height per minute, so the motion is slow and continuous rather than stepped — it is the closest thing here to watching a needle drift across a frequency scale.
Halo wraps that same scale into a circle. The sixty ticks become a ring and the marker becomes a disc that travels the band, passing behind each tick rather than over it. Both show the same readout; they differ only in whether the scale is a line or a loop. Radio remembers which of the two you last used.
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