Double exposures in Photoshop

Playing around with some more double exposure techniques in Photoshop today.

The technique for this image and the one below was exactly the same. The bottom layer was the person. I created a mask for it and added a white background. The top layer was computer readout above and city scene below. The top layer was set to "lighten". Later I added a subtle color layer and vignetted it by masking out the center. 

For this one I simply created brushes out of several strings of binary numbers and brushed various sizes of them over the cloud image.