This is the first Tangerine Dream album to feature their now classic sequencer-driven sound, which kicked off the whole Berlin School genre. This album marked the beginning of the group's international success and was their first album released on the British Virgin records label. It achieved a six-figure sale in the UK, reaching No.15 in the charts in a 15-week run, with virtually no air play, only by strong word-of-mouth. It also earned the group a gold disc in Australia, and yet amazingly in their native Germany it sold barely 6,000. "Alpha Centauri" outsold it by nearly four-to-one.
The title track and "Movements of a Visionary" rely on Christopher Franke's use of the Moog analog sequencer as a substitute for bass guitar. "Mysterious Semblance at the Strand of Nightmares" features Edgar Froese soloing on a Mellotron which is treated to slowly sweeping filter effects. "Sequent C'" is a short but memorable piece by Peter Baumann on flute, with tape echo.