Here's a few simple steps to create a gravity ball animation effect.
Open ImageReady, start a new document. I started with a preset of 297 x 300.Next, select the 'Rectangle Tool (U)' from the Toolbar, with a foreground color of your choice (I used #CCBDA8) and 'Create New Shape Layer' active on the Options Bar, draw a basic shape as I have captured below.

This is the Layers Palette view.

Next, with the 'Shape 1' layer active (highlighted in blue), click the 'Add a mask' button on the bottom of the Layers Palette (encased in red below), to add a new Layer Mask Thumbnail between the Layer Thumbnail & the Vector Mask Thumbnail. (Pointing red arrow).

Next, activate the new 'Layer Mask' by clicking on it. Then select the 'Pencil Tool (B)', set your foreground color to Black (#000000) and with a brush tip size of 27, (or of your choice) make a single click inside the Shape, and you should have something similar to below.

Next, with the 'Shape 1' layer active (highlighted in blue), click the 'Add a mask' button on the bottom of the Layers Palette (encased in red below), to add a new Layer Mask Thumbnail between the Layer Thumbnail & the Vector Mask Thumbnail. (Pointing red arrow).

Next, activate the new 'Layer Mask' by clicking on it. Then select the 'Pencil Tool (B)', set your foreground color to Black (#000000) and with a brush tip size of 27, (or of your choice) make a single click inside the Shape, and you should have something similar to below.

And here is the Layers Palette view.
Note: I enlarged the Layers Palette preview so you can see that the above Pencil click is onto the Layer Mask.
As with Layer Masks, painting with Black, HIDES. So essentially, all I did was knock a hole into Shape 1 layer, thus revealing the white color underneath from the default background layer.

As a final preparation before the animation, turn off the two Links between the Layer Thmbnails by single clicking on them. This will allow us to move the mask around during the animation without having to create additional layers for the effect.

Lets animate this Mask!
Go 'Window/Animation' to bring the Animation Palette to the foreground.

To begin:Duplicate current Frame

Note: I enlarged the Layers Palette preview so you can see that the above Pencil click is onto the Layer Mask.
As with Layer Masks, painting with Black, HIDES. So essentially, all I did was knock a hole into Shape 1 layer, thus revealing the white color underneath from the default background layer.

As a final preparation before the animation, turn off the two Links between the Layer Thmbnails by single clicking on them. This will allow us to move the mask around during the animation without having to create additional layers for the effect.

Lets animate this Mask!
Go 'Window/Animation' to bring the Animation Palette to the foreground.

To begin:

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