Optical illusion: concave or convex?

When you turn your screen it could help to see the image different.

[Eyemagination🌱✨]

Yes, such a great way to show how perspective benefits from further external cues, that provide us with more information to get an accurate /better understanding . 👍✨

[Delboy79]

Must need my eyes testing- I see no difference

[Thom Mitchell]

I'm thinking concave... But I can also see it the other way, too. Is this the back side of a dimmer switch?

[Marloes]

@rhoing Haha, great that you saw that, but... it's a left over packaging material (I forgot what was inside). Very fancy and good for an optical illusion ;)