I am really intigued by the pattern, strength, and stickiness of a spider web. Let's start with the pattern... it's so fun to see what objects a spider has used to tether the web to, and then the fact they are often circles. I mean how does a spider know if the web is the right shape? Does he or she go to web making school? Is that the only shape that holds up to the job well?
Then, I am fascinated by the sheer strength of the webbing material. It's strong! Ever seen a live bugs stuck in a web? All that wiggling and jiggling and the web still holds! That's also where the stickiness comes in.
Go look for a spider web around you and check it out!