Aside from its parks and nature areas, Singapore is intensively developed, and due to the shortage of land, is building up, down and on manmade islands and landfills.

Like so much in Singapore, admission to the Marina Bay's casino is hierarchical: Free for anyone with an international passport, costly for locals, off-limits to migrant workers altogether.

Based on German prototypes, green walls and roofs are a natural idea in Singapore's tropical environment, where mosses, ferns, philodendrons, orchids and other epiphytes literally grow on trees.

The dilemma is trying to set aside a large enough block of land or a large area where grizzly bears can live. Where humans will tolerate bears and where bears have some semblance of space where they are not constantly running into humans.

Architecture students are generally given theoretical projects, often located at distant locations, and told to come up with a design.

Right up until the late 18th century, when the first weighted lines were used to probe the ocean depths, many people believed the seas were bottomless - the watery equivalent of infinite outer space.