3D inverted Type

Creating an inverted look can be done with type or any shape using the 3D effect and some tricks. This one is quick but the effects are cool!

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Create come text. Outline the text. Type>Create Outlines. 

Select the outlined text and choose Effect>3D>Extrude & Bevel. Set the rotation settings: 35°, -25°, 20° and perspective 100° Set the Extrude Depth to 150 pt. Click OK.
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This is the result of the 3D. You can change the color just by selecting the shapes and choosing a new fill color. 
Duplicate this as we need 2 copies of this to make this work.

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With one copy of the 3D, go to the Appearance panel and click on the 3D Extrude  & Bevel link to edit the 3D.

In the 3D panel, click on the Cap box show, this will remove the face of the 3D render leaving the side panels. Click OK

This is the 3D render without the top face, showing the depth. 

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With the other copy of the 3D, use the Group Selection Tool (nested in with the Direct Selection tool) to select the face of each letter. Group those together and delete the rest of the 3D render, you will only need the face. 

Create a colored rectangle behind the type. Select the type and the rectangle.

Using the Shape Builder Tool (Shift+M) and holding option/alt, you can remove the type from the back ground rectangle creating a knockout. 

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Select the background rectangle and add an Inner Glow. Effect> Stylize> Inner Glow.

Here is the result. A cool inverted look.