Echidna rule

[caption]

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.

The echidna rolls into a ball.

The echidna unrolls.