Interesting phenomenon with iPad

[Mick F]

Mrs Mick F sitting on the settee late yesterday afternoon with the sun streaming in through the window. Reflection on the ceiling.
Only one hand, but it looks like two.

[6.5_lives_left]

Wild guess: Birefringence?

I don't know what display technology your iPad uses. Some of them have things like polarising films in them, and liquid crystals that have funny optical properties.

I agree it is an interesting phenomenon.

Edit: googling for "Do liquid crystals exhibit birefringence" seems to return a number of results that say "yes they do", so I think my guess may be right.

Of course if you say that your iPad has an OLED (Organic Light Emitting Diode) display, that blow that theory out of the window!