En af de mindst vellidte funktioner ved PlayStation 4 er de ganske lysstærke dioder, der sidder på controlleren Dual Shock 4. Nogle bliver generet af genskin i tv'ets skærm, andre af at den lyser for kraftigt op i mørke rum.
Hvad skal den egentlig til for? Det forklarer Sonys senior designer Jed Ashforth i et interview med Techradar, hvor han fortæller, at dioden skal bruges til tracking sammen med Project Morpheus, Sonys bud på en virtual reality-brille. Det kunne de bare ikke fortælle, før Morpheus var formelt annonceret.
"The tracking light - it was our department that said we need that on. It was for tracking for VR. And when all these things were coming out six months ago and everyone was going 'it's reflecting in my TV,' we were going 'oh no' because we couldn't tell anyone what it was for."