Today he took the metaphorical connection to another level. Lacking a name for the eucalypts that give this part of Portugal a flavour of the Australian countryside, he extended his "haircut trees" label. The only connection that I can see between a stubby cork oak and a tall, skinny gum tree is that both are commonly short of bark. The name connects with the distinctive feature—the exposure of the tree's trunk—and brings both entities into his realm of comprehension. One connection leads to another, as he continues to loop together his conceptual network.
When he's not indulging his passion for botany, he's having a typical four-year-old's holiday: swimming in the pool and smearing himself with ice-cream. It hasn't all been hard work.