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Use a ruler to make the strips nice and straight. They can be all 1 color, or they can be 2 different colors. For example, you could have 4 pink strips and 4 blue strips. This will be enough to make a small, 4 in (10 cm) square basket. You can cut more strips to make a larger basket.  If you are making a larger basket, cut 2 extra strips for every 1 inch (2.5 cm) that you would like to add. Construction paper will work the best, but you can also use thin plastic sheets, cardstock, felt, or thin cardboard. These methods won't work well for reed or willow because you need to prepare those materials differently. If you used 2 different colors, arrange them in an alternating pattern. For example: pink-blue-pink-blue. Make sure that the strips are almost touching. You will be adjusting the strips later on to eliminate any gaps.  You want just a sliver of space between the vertical strips because this will make weaving the horizontal strips through them easier. If you are making a larger basket, then add more vertical strips. For example, if you want a 5 in (13 cm) basket, then use 5 vertical strips total. Take 1 of your remaining 4 strips, then weave it over and under across the 4 vertical strips. Try to position it as close to the center of the vertical strips as possible. Make sure that the horizontal strip is centered, too; you want an equal amount of paper sticking out to the first and last vertical strip. If you used 2 colors for your strips, be sure to alternate them here as well. For example, if you used blue in your previous row, continue with a pink-blue-pink pattern. If you are making a larger basket, then continue to add horizontal strips. For example, if you're making a 5 in (13 cm) basket, then add a fifth horizontal strip. Slide the vertical strips closer together so that they are all touching. Next, slide the horizontal strips so that they are halfway down the vertical strips; make sure that they are touching as well. You will end up with a grid in the middle of your woven strips. There should be an equal amount of paper on each side of the grid. Starting at the top-left corner, lift the paper to expose the strip beneath it. Put a dab of glue on the bottom strip, then press the upper strip back down. Work your way around the grid until you are back where you started.  You just need to do the corners for right now. Don't worry about the top, bottom, and side edges. A glue stick will work just fine for paper, but if you are working with plastic or felt, hot glue will be the way to go. Using the top edge of the grid as a guide, fold down the paper strips to crease them, then unfold them. Repeat this step for the remaining 3 sides of the grid. You'll end up with a sort of box shape. Some of the strips may peel away from the bottom edge of your "box." Glue these down so that the edge is seamless.
Cut colored paper into eight 14 by 1 in (35.6 by 2.5 cm) strips. Arrange 4 strips side-by-side vertically. Weave a fifth strip horizontally across the 4 vertical strips. Repeat the process with the remaining 3 strips. Adjust the strips so that everything is centered and even. Glue down the corners on the grid. Fold the strips towards the center to create a box shape.