The Ping Pang is a compact thumb piano built around a circular wooden body, central sound hole, and five metal tines. It is held between both hands and played with the thumbs. It is a modest object designed for hands in motion rather than for display.

The instrument was acquired in the Midlands of South Africa in late June or early July 1999. The history preserved with it describes instruments of this kind as companions for children during long journeys, with etched markings intended as blessings for the child carrying them. I have not independently established the meaning of the individual marks, so that account remains identified as received history rather than verified fact.

The object is not known to appear in the recording of Light I Couldn't Hold. I keep it with Signal 001 because it belongs to the same documented journey, and because its purpose—giving a child something to carry and play across distance—echoes the human problem at the center of the song. Echo is not evidence of cause. It is context, and context is worth preserving honestly.

WTS A.2 / Material control. Artifact 001.04 is an extant physical object photographed under ordinary conditions. That makes it valuable not because it is mysterious, but because it is measurable. The instrument can be handled, photographed again, and recorded directly. In a record where later band media often carry obvious signs of processing, this object remains refreshingly plain: it existed before the band, and it still resists interpretation by simply continuing to exist.