Without post-processing, the two not-quite-flat surfaces result in an inconsistent line with a varying gap between them. By designing in a shadow line, the two parts will not only self-locate to ...

But a shadow forms when an opaque, or non-transparent, object blocks light from passing through and reaching a surface on the other side. Light travels in a straight line – that’s why shadows ...

We call these translucent or semi-transparent. Objects that let no light through are opaque. The closer to the light source an object is, the bigger the shadow will be. This is because the object ...