I'm letting my first black and white non-objective diptych sit for a while. Meanwhile, I started a second pair of canvases, first gessoing them twice, then applying titanium white and letting the canvases dry.
Next, I used mars black acrylic to brush on some thick, rough shapes, working loosely and feathering the edges with a semi-dry brush.
I worked with both canvases on the easel at the same time, almost touching each other. I used a similar but not exact composition on both sides.
When I get closer to being finished, I'll put the images together in photoshop.