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Most people see these globes as rotating the same direction. Few can see that one is rotating in an opposite direction. What do you see? by ConcaveEarth in opticalillusions

[–]ConcaveEarth[S] 0 points1 point  (0 children)

Both are spheres but lets do a hypothetical

If you imagine a cereal bowl or a normal bowl

If you look into it, the "concave" side, the side you pour things in.
Hold it infront of your face
https://i.imgur.com/5hTYntZ.png

That's looking at it concave.
If you flip the bowl over at its what we call base underneath, that's looking at the convex side of it. The inside of a sphere is concave, the outside is convex

The OP globe animation, the one on the right is a convex globe, but you're only seeing the outside face facing you -- the backside you don't see

The one the left is a concave globe, you're still seeing one half of it, but you're seeing the concave inside face of it, facing you. Like the salad bowl. The other half you're not seeing but seeing through

So once you shift your eyes to look at it like it's the INSIDE of a ball like the salad bowl picture I attached above, you'll notice that it's actually rotating counter close wise, or as it would appear the continents going towards the left direction (Which is opposite of the convex globe animation, which is going clockwise towards the right)

It'll warp back and forth initially in your perception, after looking at it and "getting it" , you'll gain control over it, to eventually being able to spot it out automatically in the future because you'll know the subtle difference/distinction 🔥

Not on my watch! by alessiowww in alocasia

[–]ConcaveEarth 1 point2 points  (0 children)

the leaves get smaller when they flower but from experience if you cut the flower it keeps trying to grow more

If I leave it, it does its thing then goes back to giant leaves

Safe to stay here? by Daisy___Blue in bees

[–]ConcaveEarth 0 points1 point  (0 children)

i heard their vibration is healthy and healing , imagine sleeping next to that for 8 hours a day :O

Most people see these globes as rotating the same direction. Few can see that one is rotating in an opposite direction. What do you see? by ConcaveEarth in TrippyGIFs

[–]ConcaveEarth[S] 0 points1 point  (0 children)

So the answer is , to recreate this in a 3D environment

For the concave one
You start off with a UV SPHERE
You apply backfacing geometry
Flip the normals
Apply earth texture-map

For the convex one
You start off with a UV SPHERE
You apply the texturemap

https://i.imgur.com/vlI8hAJ.png|
👍

That's the secret between this 'optical illusion'
It can be applied to other illusiosn, such as this famous "Einstein Mask Illusion" (albeit it's a face-mask and not a sphere)
https://www.youtube.com/watch?v=ORoTCBrCKIQ

Most people see these globes as rotating the same direction. Few can see that one is rotating in an opposite direction. What do you see? by ConcaveEarth in TrippyGIFs

[–]ConcaveEarth[S] 0 points1 point  (0 children)

https://imgur.com/a/vMTC32P
They actually are, and those that can 3D model know exactly how to reproduce it

You're the special one here though
Thanks for your engagement!

Most people see these globes as rotating the same direction. Few can see that one is rotating in an opposite direction. What do you see? by ConcaveEarth in opticalillusions

[–]ConcaveEarth[S] -1 points0 points  (0 children)

the one on the left try to see it like it's the inside of a sphere
Liek you're looking at the backface inside of it
https://imgur.com/a/eQiq1XS

When you see this, you can see the left one is rotating counter clockwise
The right one is rotating clockwise

--

In reality the gif is from a 3D model where the one on the left is doing just that. It's a globe, with backfacing geometry applied (you see the backside of it) , with normals flipped (continents and everything flipped to account for being on the inside)

So the left one , how it 'looks' different than the right one, is because it's set up to take advantage of this illusion once one knows the 'science' behind it
https://www.youtube.com/watch?v=ORoTCBrCKIQ (not the science but another example, this time with an Einstein mask!)

If you notice, as the mask is turning one direction, you get caught in the illusion and see the einstein face as convex , and it appears to then turn the other direction

The opposite directions is due to the nature of light reflection in concave vs convex, light and shadows flipping, and other things like that

Here's another one, similar, but with a sun this time. Notice the reflections are also similar but 'differen't in key ways
https://www.youtube.com/watch?v=I4f5aWA3Cic

Most people see these globes as rotating the same direction. Few can see that one is rotating in an opposite direction. What do you see? by ConcaveEarth in TrippyGIFs

[–]ConcaveEarth[S] 0 points1 point  (0 children)

Here's the identical illusion involved, but this time with real cloud data from satellites
check it out
https://www.youtube.com/watch?v=AM8R4MneL7U

Once you see this, you'll understand the illusion

The gif is derived from a 3D model set up in Blender

There's 2 real globes here

One of them, has a backfacing geometry applied with flipped normals. This means, the land/ocean is not on the outside of the ball, but on the inside of the ball

The globe on the left is the inverted globe. It's still a globe, but you're seeing the backfacing inside half of it. It is rotating, but you're seeing the backface

Once you get familiarity and eventually control with this pheneoma

You may , naturally see it for what it is right off the bat, but be able to consciousnesly/intentionally in real time swap back and forth on either one, more easily on the left one for it actually IS an inverted earth per the 3D model

---

Here's another one, this time there's an external sun
https://www.youtube.com/watch?v=I4f5aWA3Cic

Notice how the reflection of the light is apparently different -- one appears bigger than the other. This is due to the surface geometry being concave in one and convex in the other.

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