Ask HN: How do you make coding a more casual activity?

Is there any way to make coding something more casual and informal instead of being so structured and feeling unchangeable?

I want to tinker with this bit without causing this bit and that bit to blow up. I want to stretch this line without the code in line number 45 explode. I want a way to make coding feel more like I'm playing with putty and less like I'm working with cement.

What options are there (if any) for doing this?