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I am watching a YouTube tutorial on sculpting and I can't seem to figure out how he suddenly created a box around his mesh...

enter image description here

I don't believe it is bounding box because when I searched up how to create bounding boxes, it sounds like multiple steps to do so. All the guy did in the video was change to edit mode, unless he pressed a shortcut key. Can anybody tell me what this guy did to get the box around the mesh for editing?

PS: I'm fairly new to Blender but I know the basics.

Here is the video I was watching: https://youtu.be/tZnUgt659oI?t=3m5s

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What you're seeing is the original mesh - the cube. In the tutorial they add a Subsurf modifier and the cube immediately turns into a low poly sphere. However, the modifier has not been applied to the cube, meaning the original cube geometry still exists, which is what you see when they enter Edit Mode.

This allows you to move the original geometry of the cube and see the Subsurf result update in real-time. The original geometry is called the Edit Cage when there is a Subsurf modifier present.

Here I have added a Subsurf modifier to Blender's 'Monkey' mesh. You can see the original, low-poly cage (the black wires) around the smooth Subsurf geometry (the grey surface):

enter image description here

So, in short, it was simply changing to edit mode that made the box (the original geometry) appear.

You can read more about modifiers, how their results are displayed in the viewport and their visibility options, here.

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To add to Ray's answer : In the subsurf modifier options he has the "Display modifier in Edit mode" enabled. enter image description here

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