Magik (vol. 1) #3 (Feb. 1984): "Soulquest", page 11, panel 4:
Illyana Rasputin: "Oh! A light circle-- Cat called them 'stepping discs,' from a novel she read. They transport you through Limbo in both space and time."
Note: In Uncanny X-Men (vol. 1) #160, Kitty Pryde (later known as "Cat" in Limbo) compared the light circles in Limbo to "Larry Niven's stepping discs."
The Uncanny X-Men (vol. 1) #160 (Aug. 1982): "Chutes and Ladders!", page 6, panel 2:
Kitty Pryde (thinking): "Wow! This place looks as awful as I feel! That light must have been a teleport mechanism, like Larry Niven's 'stepping disks'."
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