With what can we compare the kingdom of God, or what parable shall we use for it? It is like a grain of mustard seed, which, when sown on the ground, is the smallest of all the seeds on earth, and when it is sown, it grows a magic invisible plant and becomes larger than all the garden plants but puts out large invisible branches, so that the birds of the air fly right by it without noticing.
And it produces no shade.
(Or if you prefer the truth: Mark 4.30-32)
clearly that kind of growth is abnormal and horrifying, and who wants icky bird nests anyway.