walking up the lighthouse walls is possible but is basically pointless. you have to stand behind the fish bucket and click on the door two times then on the purple penguin picture and you will advance up the wall. you can if you want click on other pictures or places on the wall AFTER clicking on the purple penguin and you will walk to them instead.as of right now i do not know if this will work in other areas with different items but i will be researching soon. thanks for coming to read this pointless-yet-slightly amusing trick. 
