from 1973 to 1975 a major addition was added to the right-hand side of the building. the upright stems branch in all directions and form a wide bushy dome. the total cost of the project was below the original estimate, at either £47,000 or £47,500. left with a boat building kit by the mysterious dog, they try various means of constructing a boat, which fail. the room with the main lake is made accessible from the big room by a  metal ladder. this species associates with barrel sponges, sometimes living within the sponge. 