How to build a pyramid with 30 cards?

1. First, prepare a deck of playing cards and find a flat desktop.

2. Use two playing cards to form an A-shaped triangular column. (The spacing at the bottom should not be too big or too small, just be stable. )

3. The distance between the tops of two triangular pillars should be kept at the length difference of a playing card. At this time, put a card on the two sharp corners.

4. Fold the first layer as above.

5. Stacking two floors is the same method, except that the number of columns should be reduced upwards, depending on the length of the bottom floor.

6. The higher the stack, the more you should keep your hands shaking, otherwise you will fall short.

7. It's done! I only folded a deck of playing cards five times.