By David Browne
Updated January 24, 1997 at 05:00 AM EST

In techno and ambient, there’s a fine line between arresting and anesthetized. On 68 Million Shades, Spring Heel Jack keeps meandering across that line. Gently nudged along by stuttering, boinging beats and warm baths of synthesizers, the record has moments of airy, disquieting tranquility. But it could double as Muzak for a department store’s Gen-X section.