In a scientific paper, David proposed that the sea squirt, a sedentary sac of a filter feeder, had once been a higher fish but had “degraded” into its current form due to a combination of “idleness,” “inactivity and dependence.” He wasn’t sure of the exact mechanisms that would cause such a deterioration, but to David, the sea squirt was a clear warning. A cautionary tale in laziness. A literal sad sack.
