E whakakotahi ana i te ngāwari o te rapa me te ngāwari o te tukatuka me te hanga kirihou; he ātete ki te pāmahana mai i te -60℃ ki te 135℃, he ātete ki te UV, he ātete ki te koroheketanga o te ozone, ā, e kore e pakaru, e whakapakeke rānei i te whakamahinga roa o waho. He ātete ki te kakahu me te haehae, he pakari te mau, he hiri me te mimiti ru; kāore he paitini, kāore he kakara, ka taea te hangarua, ā, he hoa taiao.