Effectiveness of fake nest

There are difference type of fake nest that can be install in your BH to encourage birds to built nest.  My favourite still on the styrofoam fake nest.  The reasons are that you can craft the shape based on creativity & styrofoam that you have.  I normally use the recycle styrofoam to craft the fake nest.  Take a look at my 'product'.

Lets take a look at the nest build on the fake nest.  The nest may not look beautiful & the value/grade will be lower.  Who care, our purpose of fake nest is to encourage bird to build nest & increase our tenants.