Point

def Point(*args)
  case args.first
  when Integer then Point.new(*args)
  when String then Point.new(*args.first.split(':').map(&:to_i))
  when ->(arg){ arg.respond_to?(:to_point) }
    args.first.to_point
  when ->(arg){ arg.respond_to?(:to_ary) }
    Point.new(*args.first.to_ary) else
  raise TypeError, args.inspect} to Point" end
end