Geometric designs are getting more and more popular today, and this shoe rackis inspired by them. Each module here is a triangular tube, the length and size of the module depends on your shoe size! Start by creating a module: cut a piece of cardboard to the size you need, here it’s about 21″x24″. Score it into 3 equal sides. Use a piece of duct tape and tape the piece into a triangular tube like shown above. Now you have the first module, repeat to create more, make them as much as you need. Glue or tape each row onto thick cardboard so they stay together. Read what to do next in the source.