Basically, curios that go in a special 4-slot area and can be used again and again, and instead of only giving more LP per study with quality increase, they also get more uses.
As a tradeoff, the uses increase by cube root instead of square root, e.g. cube root(quality/10) instead of sqrt(quality/10), so doubled at q80. As another tradeoff, each time period acts as an individual curio, meaning you have to come online if you want the LP from the cycle.
Initial suggestions for possible items:
Toy Farm: 3x Cone Cow, 3x Board, 3x Branch
Looks like a couple of cone cows inside a fence next to a barn, the entire thing on top of a block of wood.
Base Uses: 8
Base LP Gain/Cycle: 40
Cycle Time: 20 Minutes
Diviner's Tools: 1x Seer's Tealeaves, 1x Seer's Bowl, 1x Seer's Bones, 1x Völva's Wand, 3x A Beautiful Dream, 1x Linen Cloth
Looks like a set of the above on a cloth with magic flowing between.
Base Uses: 7
Base LP Gain/Cycle: 1000
Cycle Time: 8 Hours