rocks
i've stood in awe at the ruins of the temple of olympic zeus. it's a gotta see if you get to athens. i took a picture of alisa with a column. then i moved away and took another. then i moved away some more and took another. and again. and finally i was so far away my wife was a tiny white smudge at the bottom of the column. anywho, it's fascinating to think ancient greeks piled those rocks without modern heavy machinery. i think when i retire and have a big empty chunk of land i'm going to stack rocks the old fashioned way.