Pyroclastoctopus: a hiding lesson

If it weren't for the reddish tentacle's underside it would have been impossible to make a difference between the "Octopus vulgaris" and his hiding place. The surrounding rock is a pitch black pyroclastic material of basaltic composition with scattered carbonate-covering algae of a thousand colours. The piroclasts deposited in a sub-aereous environment in Lanzarote. Sea level rise, due to volcanic downlift, tectonic tilting, climate change and subaereous erosion are all needed to explain the hiding place of such a beautiful animal in a perfect and outstanding costume. Don't forget the octopus' crab-tapa, can't you see it?