On the right side is a regular setTimeout slide show. The time delay is the same with all the pictures. It's "one second" interval for each.
On the left side is a *setTimeout* slide show with different time set for each picture. Between the spring and the bugs it's 2 seconds. Between the bugs and Jenny is also 2 seconds.
It takes a total of 12 seconds for the loop to make one round. Then the first slide takes 4 sec.