Gouache. There is a structural error in this painting (sorry Patrick!). The support beams of the porch should go up further--that gray bar that they end at is where the porch ceiling connects to the house at the back of the porch. The beams actually go up to the bottom of the white strip with the house number on it. The problem with gouache is that there is no good way to fix a mistake like that. I guess I should have just been paying closer attention to what I was painting!