Dating rock art is difficult, but some of the sites subjected to direct dating pre-date Austronesian arrival, like the Lene Hara paintings of East Timor which has an age range of 6,300 to 26,000 BP. Conversely, others are more recent and can be dated indirectly by their subjects. The depictions of pottery, ships, and metal objects, for example, put certain rock art sites at a range of 2,000 to 4,000 BP. Some hunter-gatherer groups have also continued to produce rock art well into the present period, as evidenced by their modern subjects.