(1) Figure ① can be regarded as 1×4, Figure ② is 2×4, Figure ③ is 3×4, Figure ④ is 4×4, Figure ⑤ is 5×4 and Figure ⑤ is 6× 4;

(2) According to the law of (1), graph n can be regarded as 4n, and it can be solved by the summation formula of natural numbers.

Solution: According to the diagram in the problem, you can:

The first body type needs 1×4=4 pieces;

The second text requires 4+4=2×4=8 blocks;

The third article requires 4+4+4=3×4= 12 blocks;

The fourth article requires 4+4+4+4=4×4= 16 blocks;

The fifth body type needs 4+4+4+4=5×4=20 pieces;

The sixth text requires 4+4+4+4+4=6×4=24 blocks;

…;

The nth text shape needs 4+4+4+…+4=4n blocks.

How many pieces does it take to swing the 20th square in this way?

The 20th text requires 4+4+4+…+4=4*20=80 pieces.