Detail drawing week 6 (riveted, welded, nut and bolt joints)

In this week, we need to observed 3 different joints which is riveted, welded, nut and bolt joint. From the observation,  we need to sketch 3 different types of object (either furniture, architecture, interior and others) from Singapore which we having a study trip on last week Friday to Sunday (6th May to 8th May). On this trip we went a lot places to observed the architecture and interior which quite interesting. More over, I like tge ways how they constructed according to the human needs and the balances between cities and nature environment. For us as a designer, I think we should have think of eco environment when we designing either interior or exterior. Because if our mother earth is damage, where will be our home?