In one sentence, describe what the following article is about:

One piece is perpendicular to the other, with one pointy end lined up with the slot in the top center of the other piece. Both pieces should be face down, so that the corners want to fold in to the table you're working on rather than out into the air. Make sure to choose the appropriate corner and slot so that the squares at the center of each piece are now positioned perfectly next to each other. The diagonal line on the bottom triangle of the white piece should perfectly line up with the diagonal line going across the center of the red piece. It should also be face down and even with the center of the red piece. The diagonal corner of the blue piece should be parallel to the diagonal line pointed out in the step above. The two diagonal lines pointed out above should now meet to form just one diagonal line going from the corner of the red square to the corner of the white triangle, with the blue triangle sitting along the line. The three squares at the center of each piece should be lined up in the shape of an L with the red at the corner, so that the red square borders the other two and the white and blue squares only touch at one corner. The white corner is the end of the diagonal line referred to above. Slip it into the nearest blue pocket. This will create a half cube, formed by three squares which all border each other. Each side should also be half its original color and half the color of the piece that got tucked into it. The figure will now be 3D, so that it can no longer sit flat on the table. When you position the cube with one side on the table, the leftover corners should form diagonal halves of the last three sides of the cube. From this position, you can easily add the next side. Make sure it's lined up the right way. The top triangle will line up perfectly with the triangle from the earlier piece of the same color so that those two triangles together will form a square on one of the other sides left to be filled. The other triangle, the bottom one of the piece you're putting in, should tuck into a fold on a side already in place. Here, slide the white corner into the blue pocket to attach the blue piece. Where possible, tuck loose corners into the corresponding pockets on the sides they should attach to.  Again, make sure the piece is lined up such that its triangular corners can slip into the pockets on the sides they should attach to.  Tuck loose corners into their corresponding pockets. At this point, you should have two loose flaps on the only side left to add; everything else should be tucked in. Again, line it up such that the loose flaps will fit into the pockets of the piece. This will firmly attach the last side of the cube.

Summary:
Take two pieces and position them like so. Slide the corner of the red piece into the pocket of the white piece. Now position a third piece (blue in our example) as shown. Slide corner of blue piece into the pocket of the red. Take the corner of the white piece and put it into the pocket of the blue. Flip half cube to its side so a corner is facing up as shown. Position a forth peace (here, blue) and line it up with one of the sides left to be filled. Slide the corner into the piece you're putting in to attach it. Check the sides for any loose corners. Turn the cube to a side with another triangle flap (here, red) facing up. Position a fifth piece (white) and line it up with the triangular flap. Slide the triangular flap into the corresponding pocket to attach the new side. Check sides for any loose corners. Position the last peace (red) and line it up with the last empty side of the cube. Slide the loose flaps into the corresponding pockets. Tuck all loose flaps into their corresponding pockets and the cube is complete.