It’s very difficult to make an ice sculpture. First of all, ice must be carefully selected. You need clear, transparent ice. Sometimes snow blocks are carved. By the way, dyes can be added and you’ll have colored ice blocks.
However, lifetime of a sculpture is very short and depends on the temperature of its environment.
To tell the truth, there are many annual ice sculpture competitions in the United States, China, Japan, Canada, Finland, Russia etc. One of the most prestigious international competitions takes place in Fairbanks, Alaska. The 1934 celebration was called the Fairbanks Winter Carnival. By 1938 the now four-day celebration was officially called the Ice Carnival and Dog Derby. Dog races were a major feature of the celebration and the Ice Carnival was the other. Something of seemingly insignificant importance was happening as the Carnival grew. The purpose of the early sculptures was to stage the crowning of the Carnival Queen and King. The sculpted thrones were a place to meet and celebrate.