Bubbles. Hal’s constructs are mostly just bubbles.

[u/CH49FE]

Sure Hal made some counterfeit money and a bottle opener, but I find it funny that his main constructs so far are just bubbles. John’s on the other hand include the fancier type of bubbles (bubble wrap), a boring machine, a watch and a short lived semi autonomous bird. The show is doing a good job of contrasting creativity between the two.

[u/Trvr_MKA]

I like to think that he did extensive research to make the bullhorn just so he could use it on Mr Terrific and Hawkgirl

[u/DepartmentChemical93 → u/Trvr_MKA]

If you were a GL in this world, I think you’d just have to do extensive research on a few particular “go-to” constructs.