this were single shot pinhole cameras. made from a tall beer can. it just had a cap on top to keep out the light and je just needed to slide the transparent ribbon with some black tape to the side to start taking pictures. the bonus is that you can try out some fast things with it. and it can expose the sprockets of your 135 film. but over all less fun to walk around with and take pictures with then the ICD P line up. since you had to make a lot of ICD C cameras or cary a dark room bag with you and try to chance it out in less then ideal places… but it was fun prof of concept that others have explored as well.