A panoramic of the first apse in Tarxien South shows you how it oddly mimics the exterior façade of the temple, with a concave shape. You can also see how ornate the carvings became, with double pairings of spirals that look almost like waves on the ocean. (For a closeup, click past the next photo.) Spirals are found in many Maltese temples, but these are the most elaborate and finely etched of all. Clearly, the stone-working technologies of these prehistoric people had improved over the centuries.