Artists & designers want to be in creative control over how their work is presented. Some of these (in my eyes) very obvious and basic principles have yet to be implemented by Squarespace for 7.1.
Anyways, the image blocks are full bleed. For a moment I was hopeful it's possible to add the original image as a background and use a transparent png in front of it to keep a height, but the background looks cropped. DIdn't spend much time on it so you could try yourself.
Comfort got a reaction from Photograffix in image height in masonry grid
