Attach strips of masking tape directly to the cutting surface and use the cutter and ruler to cut them into squares first and then cut the squares in half diagonally.
![DIY Lampshade / Step 1: Cut texture DIY Lampshade / Step 1: Cut texture](/en-gb/files/images/202310/7/tesa-trendpapier-9-idee-5-lampenschirm-schritt-1,11101468_canvas1x1_18.webp)
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Enlightening. It's a good thing we paid attention in geometry. Because isosceles triangles turn this lampshade into a work of art.