Tip: Try cheaper cards, which typically have less gloss and aren't so slippery. Index or recipe cards from an office supply store are also a good way to learn.
Start with a four-card cell: The four-sided cell is the foundation of every one of Berg's projects, and he uses it to create card structures of all shapes and sizes. Tested in a structural engineering lab, Berg's cells will support 660 pounds per square foot, which is why this formation allows your card towers to grow incredibly tall. Hold the first card in your left hand. Don't let go of it while you use your right hand to add the second card and create a "T."