A 3-D pyramid can be made of anything because the shape itself is what makes a pyramid a pyramid. The key is to engineering a pyramid is getting the polygonal base right. If you're making a pyramid for school or just constructing one for an art project, use your imagination when coming up with the materials. Make a pyramid out of household items, including cans or boxes. Square items of a similar size are ideal for this project.
Spread the cardboard sheet on a clean, flat surface and find the centre of the cardboard by measuring the distance from one edge to the opposite edge and dividing by two. Do this for both the vertical and the horizontal edges. Once you have found the centre, mark it with a small dot.
Take four of the identical items you have chosen and set them on the cardboard sheet so that a corner of each of the items is touching the dot in the middle. Glue the items in place.
Add more of the identical squares to the original four so that you have a five-by-five square. Glue all the pieces in place.
Arrange 16 more of the items on top of the 25 that you have glued down so that they form a four-by-four item square on top of the five-by-five square. Glue the items in place.
Continue adding items to make a layer of three-by-three items on top of the last four-by-four square, followed by a two-by-two square and topped by the one remaining item. Glue all items in place.