A new trend is making its way through cyberspace – long shadow design.

The concept, which borrows themes from flat design, is popping up in a big way in recent weeks. The trend is impacting user interface elements and icons the strongest, but is starting to creep into other parts of website design.

Long shadows extend far past the object in which they mirror.

“Long shadow” is not a new term. It is actually borrowed from lighting and photography. Photographers often show long shadows in images to create a high-drama effect. In natural light, long shadows are cast when the sun ins near the horizon, occurring both at dusk and dawn.

In design, long shadows have become a quick trend. In design, long shadows are being added to objects in flat design schemes. The shadows, which often rest at a 45-degree angle, mirror an object and add a lot of emphasis and drama.

What’s different about these shadows are that, they too, are flat. Designers are creating long shadows using a tint of the color with no fading, shading or graduation of color.

It seems like many designers hopped on long shadows almost all at once and are using the same basic idea. Even as far as the direction and angle of each shadow. (Most shadows fall to the lower right corner of the object at a 45-degree angle, although some designers are using 120 degrees.) Shadow edges are sharp and add an extra element of depth to the overall design.

Long shadow design is more limited than other concepts, because it is intended only for small elements. It is not something that designers are using for an entire project and is almost exclusively limited to icons or buttons.

So far, long shadow design is used primarily for smaller objects and elements such as icons. Shadows live within the element and often extend beyond an object to the surrounding frame. Many of the long shadow concepts we are seeing come from projects where designers are looking for creative ways to build icons for the upcomingApple iOS 7.

Long shadow design is borrowing a lot of the principles of flat design. It could even be considered a form of flat design (or you might call it “almost flat”).

Long shadow design is based on simple shapes and clean lines, as is flat design. It also uses a color palette that is bright and vibrant. Color is also used for shadows, which may just be a shade darker than the hue it mirrors, rather than black or gray.

By picking up and mirroring flat design concepts, long shadow design is meant to be used in conjunction with a flat design scheme. Elements employing long shadow design can be used with elements that are completely flat to create an interesting overall design scheme.

Where long shadow design removes itself from flat design is with the idea that elements take on more of a three-dimensional effect. While it works for long shadow design, some purists may argue that any effect designed to create that extra layer of dimension is not entirely flat.

Long shadow design is popular in mockups right now, although not as many projects have made it to publication yet. (But expect to see quite a few of them soon.)

The most notable example of long shadow design right now comes from American retailer JC Penney, which is running a television and internet ad campaign that uses long shadows.

Dribbble is a great place to look for flat and long shadow design inspiration. Here’s a gallery of some great examples of long shadows.