Hypnosnakes

With four snakes in the spiral, the motion effect should be more pronounced, so keep staring !

If it still won’t work, try again after a Guinness.

(You can find both drawings – Snakespiral and Hypnosnakes - amongst others, on the tray of Suns of Arqa’s “Solar Activity 1979-2001”.
By the way: an excellent compilation of SOA’s wayward music.)