Tie a Starting Knot as shown, then make both laces into "loops" by simply doubling them back onto themselves.People often refer to these as "Bunny Ears".

Cross the two loops over each other so that the right (dark) loop ends up in front and the left (light) loop ends up behind. The (light) loop is now  the right loop.

Begin to wrap the right (light) loop around the left (dark) loop to end up in front.

Wrap the left (dark) loop around the back. You will end up with the ends of both loops on opposite sides of the "hole" in the middle.

Feed both ends of the loops through the hole in the middle. The right (light) loop goes out the back and the left (dark) loop comes out the front.

Now, simply pull the loops to tighten the knot. The whole twisted mess of the previous drawing will rearrange itself into a neat finished knot. Trust me, it works.

The finished knot should be a tight, closed knot with a symmetrical, double wrap around the middle.

Important Note for Parents / Teachers. If you ever re-tie a child's laces that have come partly undone, with the above or a standard bow, make sure that you're not inadvertently creating a "Granny Knot"! Don't be tempted to take a short-cut! You should always undo and then re-tie their starting knot just in case theirs was tied the opposite way to yours. The end result could be a "Granny Knot" easily identified as the loops will lie Heel to Toe instead of across the shoe and will easily come undone again.