Sony AIBO Explorer User Manual page 54

Face side lights
These face side lights indicate the emotions of AIBO. The examples are shown
below.
Face side light
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Red (back)
(lights instantaneously)
Blue (center)
(lights instantaneously)
Blue (front)
(lights instantaneously)
Blue (center)/Red (back)
(alternately)
Blue (front)/ Red (back)
(simultaneously)
Angry
Happy
Sad
Surprised
Reluctant