The fact that so many Gerzean sites are at the mouths of wadis which lead to the Red Sea may indicate some amount of trade via the Red Sea (though Byblian trade potentially could have crossed the Sinai and then taken to the Red Sea).[64] Also, it is considered unlikely that something as complicated as recessed panel architecture could have worked its way into Egypt by proxy, and at least a small contingent of migrants is often suspected.[63]