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Create a copy of each cube below itself.

Opacity Masks In the past Opacity Masks were the only way to make a transparent gradient in Adobe Illustrator, but with newer versions, the need to use this feature is lost on some designers. As with all things, it’s sometimes the old techniques that yield the best results and you shouldn’t overlook the effects made with the Opacity Mask. Opacity Masks can be used to control the intensity and hue of highlights on icons, create complex reflections and mask raster effects. Using the Opacity Mask will result in a much brighter and better defined result than an Opaque to Transparent gradient and

has the flexibility to add linear or radial gradients to complex color blends. To create an Opacity Mask, select an object or group of object you want to mask, open the Transparency panel and double click to the right of the image thumbnail to go into an editing mode to edit the mask area. Draw the area you want to be the mask. White areas will show the object, black will mask it, and shades of grey will create varying percentages of opacity. By building icons with layered transparent shapes, you can create realistic and glossy icons that are scalable and easy to edit.