A few photo sites have been piling up in my “to blog” bookmarklet, with no real connection to each other except that they're light on words, heavy on pretty pictures. So, as we head into Memorial Day weekend, give your ocular senses a vacation from their problems.

• Periscope Shots - Eerie vintage photography taken through the periscopes of submarines, sometimes just as the target starts to sink after a direct torpedo hit. Mesmerizing.
• Bill Dan Gallery - And equally fascinating but in a more Zen kind of way. Bill balances rocks. And...well, that's it really. You expected Zen to be complex?
• Frederik Ödman - “The meeting point of logic, imagination and madness”.
• Flickrchicks - Hot chicks found on Flickr. Sometimes the simplest ideas are the best.
• Opera 2003 - the best display for 3D images I've seen online